docs: review document for #264

Issue: #264 User-Visible: no
docs: refresh screenshot source fingerprint
2026-09-29 03:09:36 +00:00 · 2026-08-27 18:05:24 +00:00 · 2026-08-27 20:43:34 +03:00 · 2026-08-27 20:32:12 +03:00 · 2026-08-27 20:30:07 +03:00 · 2026-08-27 16:58:08 +00:00
302 changed files with 22440 additions and 5030 deletions
@@ -1,4 +1,4 @@
-name: Announce release
+name: Анонс релиза
 # Telegram notifications for t.me/ha_houseplan (owner request, 2026-08-07).
 # Stable releases are announced; prereleases are deliberately silent.
 # workflow_dispatch exists purely as a connectivity test button and therefore
@@ -36,6 +36,7 @@ permissions:
  contents: read
 jobs:
  telegram:
+    name: Оповещение в Telegram (только стабильные)
    if: ${{ github.event_name == 'workflow_dispatch' || (github.event_name == 'release' && github.event.release.prerelease == false) || (github.event_name == 'workflow_call' && inputs.prerelease == false) }}
    runs-on: ubuntu-latest
    steps:
@@ -9,7 +9,7 @@
 # локально через `npm run docs:accept -- --reviewed --from=<распакованный>`.
 # Та же конструкция, что у golden-эталонов, и по той же причине: картинки
 # попадают в репозиторий через явное решение, а не через бота.
-name: Docs screenshots
+name: Скриншоты документации

 on:
  workflow_dispatch:
@@ -24,6 +24,7 @@ permissions:

 jobs:
  capture:
+    name: Съёмка и сверка скриншот-индекса
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
@@ -1,4 +1,4 @@
-name: Mutation gate
+name: Мутационный гейт

 # Реестр известных поломок (issue #85): каждый мутант ломает продуктовый код
 # известным способом, и объявленный тест ОБЯЗАН на этом покраснеть. Тест,
@@ -31,6 +31,7 @@ concurrency:

 jobs:
  mutants:
+    name: "Мутанты: каждый обязан красить тесты"
    runs-on: ubuntu-latest
    # Все мутанты × (сборка + свой guard) — это десятки минут, и это нормально:
    # гейт предрелизный. Час — потолок против зависшего Chromium.
@@ -1,4 +1,4 @@
-name: Full Performance
+name: Полные бенчмарки производительности

 on:
  # Every main promotion is a stable-release candidate and must have an
@@ -24,10 +24,21 @@ concurrency:

 jobs:
  performance:
-    # Base and candidate stay sequential on one hosted runner. Splitting them
-    # across runners would turn machine variance into a false regression.
+    name: Бенчмарки рендера и геометрии
+    # Every profile keeps base and candidate sequential on one hosted runner.
+    # Independent profile pairs run in parallel: cross-profile timing is never
+    # compared, while serialising all five pairs cannot fit the job timeout.
    runs-on: ubuntu-latest
    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        profile:
+          - large-house
+          - isometric
+          - plan-snap
+          - blend
+          - overlay
    steps:
      - name: Check out candidate
        uses: actions/checkout@v7
@@ -149,38 +160,78 @@ jobs:
          npm --prefix candidate run build
          (cd candidate && node scripts/bundle-sync.mjs)
          npm --prefix baseline run build
-          (cd baseline && node scripts/bundle-sync.mjs)
-
-      - name: Capture base and candidate profiles
-        working-directory: candidate
-        run: |
-          npm run benchmark:large-house -- --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/baseline.json
-          npm run benchmark:large-house -- --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/candidate.json
-          npm run benchmark:large-house-isometric -- --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/isometric-baseline.json
-          npm run benchmark:large-house-isometric -- --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/isometric-candidate.json
-          npm run benchmark:large-house-plan-snap -- --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/plan-snap-baseline.json
-          npm run benchmark:large-house-plan-snap -- --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/plan-snap-candidate.json
-          npm run benchmark:glow -- --profile=large-light-blend-v1 --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/blend-baseline.json
-          npm run benchmark:glow -- --profile=large-light-blend-v1 --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/blend-candidate.json
-          npm run benchmark:glow -- --profile=large-house-glow-overlay-v1 --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/overlay-baseline.json
-          npm run benchmark:glow -- --profile=large-house-glow-overlay-v1 --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/overlay-candidate.json
-          if ! grep -q "glow_enabled" ../baseline/src/logic.ts; then
-            echo "Base predates independent Glow; bootstrap relative overlay baseline, keep absolute gate"
-            cp ../artifacts/performance/overlay-candidate.json ../artifacts/performance/overlay-baseline.json
+          if [ -f baseline/scripts/bundle-sync.mjs ]; then
+            (cd baseline && node scripts/bundle-sync.mjs)
+          else
+            echo "::notice::The comparison base predates bundle-sync.mjs; materializing its freshly built bundle with the legacy copy path."
+            mkdir -p baseline/custom_components/houseplan/frontend baseline/demo/srv/assets
+            cp baseline/dist/houseplan-card.js baseline/custom_components/houseplan/frontend/houseplan-card.js
+            cp baseline/dist/houseplan-card.js baseline/demo/srv/assets/houseplan-card.js
          fi

-      - name: Enforce relative and absolute performance budgets
+      - name: Capture base and candidate profile
        working-directory: candidate
+        env:
+          PROFILE: ${{ matrix.profile }}
        run: |
-          npm run benchmark:compare -- --baseline=../artifacts/performance/baseline.json --candidate=../artifacts/performance/candidate.json --output=../artifacts/performance/comparison.json
-          npm run benchmark:compare -- --budgets=demo/performance/budgets-large-house-isometric.json --baseline=../artifacts/performance/isometric-baseline.json --candidate=../artifacts/performance/isometric-candidate.json --output=../artifacts/performance/isometric-comparison.json
-          npm run benchmark:compare -- --budgets=demo/performance/budgets-large-house-plan-snap.json --baseline=../artifacts/performance/plan-snap-baseline.json --candidate=../artifacts/performance/plan-snap-candidate.json --output=../artifacts/performance/plan-snap-comparison.json
-          npm run benchmark:compare -- --budgets=demo/performance/budgets-large-light-blend.json --baseline=../artifacts/performance/blend-baseline.json --candidate=../artifacts/performance/blend-candidate.json --output=../artifacts/performance/blend-comparison.json
-          npm run benchmark:compare -- --budgets=demo/performance/budgets-large-house-glow-overlay.json --baseline=../artifacts/performance/overlay-baseline.json --candidate=../artifacts/performance/overlay-candidate.json --output=../artifacts/performance/overlay-comparison.json
+          mkdir -p ../artifacts/performance
+          case "$PROFILE" in
+            large-house)
+              npm run benchmark:large-house -- --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/baseline.json
+              npm run benchmark:large-house -- --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/candidate.json
+              ;;
+            isometric)
+              npm run benchmark:large-house-isometric -- --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/isometric-baseline.json
+              npm run benchmark:large-house-isometric -- --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/isometric-candidate.json
+              ;;
+            plan-snap)
+              npm run benchmark:large-house-plan-snap -- --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/plan-snap-baseline.json
+              npm run benchmark:large-house-plan-snap -- --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/plan-snap-candidate.json
+              ;;
+            blend)
+              npm run benchmark:glow -- --profile=large-light-blend-v1 --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/blend-baseline.json
+              npm run benchmark:glow -- --profile=large-light-blend-v1 --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/blend-candidate.json
+              ;;
+            overlay)
+              npm run benchmark:glow -- --profile=large-house-glow-overlay-v1 --target-root=../baseline --samples=7 --warmups=1 --output=../artifacts/performance/overlay-baseline.json
+              npm run benchmark:glow -- --profile=large-house-glow-overlay-v1 --target-root=. --samples=7 --warmups=1 --output=../artifacts/performance/overlay-candidate.json
+              if ! grep -q "glow_enabled" ../baseline/src/logic.ts; then
+                echo "Base predates independent Glow; bootstrap relative overlay baseline, keep absolute gate"
+                cp ../artifacts/performance/overlay-candidate.json ../artifacts/performance/overlay-baseline.json
+              fi
+              ;;
+            *)
+              echo "::error::Unknown performance profile: $PROFILE"
+              exit 1
+              ;;
+          esac

-      - name: Upload full performance reports
+      - name: Enforce relative and absolute performance budget
+        working-directory: candidate
+        env:
+          PROFILE: ${{ matrix.profile }}
+        run: |
+          case "$PROFILE" in
+            large-house)
+              npm run benchmark:compare -- --baseline=../artifacts/performance/baseline.json --candidate=../artifacts/performance/candidate.json --output=../artifacts/performance/comparison.json
+              ;;
+            isometric)
+              npm run benchmark:compare -- --budgets=demo/performance/budgets-large-house-isometric.json --baseline=../artifacts/performance/isometric-baseline.json --candidate=../artifacts/performance/isometric-candidate.json --output=../artifacts/performance/isometric-comparison.json
+              ;;
+            plan-snap)
+              npm run benchmark:compare -- --budgets=demo/performance/budgets-large-house-plan-snap.json --baseline=../artifacts/performance/plan-snap-baseline.json --candidate=../artifacts/performance/plan-snap-candidate.json --output=../artifacts/performance/plan-snap-comparison.json
+              ;;
+            blend)
+              npm run benchmark:compare -- --budgets=demo/performance/budgets-large-light-blend.json --baseline=../artifacts/performance/blend-baseline.json --candidate=../artifacts/performance/blend-candidate.json --output=../artifacts/performance/blend-comparison.json
+              ;;
+            overlay)
+              npm run benchmark:compare -- --budgets=demo/performance/budgets-large-house-glow-overlay.json --baseline=../artifacts/performance/overlay-baseline.json --candidate=../artifacts/performance/overlay-candidate.json --output=../artifacts/performance/overlay-comparison.json
+              ;;
+          esac
+
+      - name: Upload full performance report
        if: always()
        uses: actions/upload-artifact@v7
        with:
-          name: full-performance
+          name: full-performance-${{ matrix.profile }}
          path: artifacts/performance
@@ -1,4 +1,4 @@
-name: Process
+name: Ревью-конвейер

 # Событийный конвейер процесса (PROCESS.md). Смена статусной метки — это
 # сообщение: она порождает событие, событие запускает следующий шаг.
@@ -35,6 +35,7 @@ permissions:

 jobs:
  guard:
+    name: "Страж: ребейз на dev и предпосылки ревью"
    runs-on: ubuntu-latest
    outputs:
      stage: ${{ steps.decide.outputs.stage }}
@@ -162,6 +163,7 @@ jobs:
          echo "limit=$limit" >> "$GITHUB_OUTPUT"

  review:
+    name: "Ревью (Claude): вердикт в issue"
    needs: guard
    if: needs.guard.outputs.stage != ''
    runs-on: ubuntu-latest
@@ -287,6 +289,16 @@ jobs:
          echo "note=Ветка приведена к dev конвейером до ревью: поверх легло $behind коммит(ов) dev, $short_before -> $short_after. После ребейза это другой код (§7.2) — разбор полный, а не по дельте." >> "$GITHUB_OUTPUT"
          echo "ветка $BRANCH приведена к dev: $short_before -> $short_after"

+      # Материал ревью — конкретный SHA (#312). Вердикт применим только к
+      # нему: если во время ревью в ветку прилетит коммит, шаг слияния обязан
+      # это заметить и отказаться, а не молча увезти в dev непроверенный код.
+      - name: Зафиксировать SHA материала ревью
+        id: material
+        if: steps.rebase.outputs.conflict != 'true'
+        run: |
+          echo "sha=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"
+          echo "материал ревью: $(git rev-parse --short HEAD)"
+
      # Конфликт возвращает задачу автору ДО ревью. Инвариант «после прогона
      # метка меняется всегда» при этом держится: возврат в S6-in-progress —
      # тоже смена метки, и автор не ждёт впустую.
@@ -701,14 +713,42 @@ jobs:
          GH_TOKEN: ${{ secrets.HP_PROCESS_TOKEN }}
          BRANCH: ${{ steps.branch.outputs.name }}
          NUM: ${{ github.event.issue.number }}
+          MATERIAL_SHA: ${{ steps.material.outputs.sha }}
        run: |
          if [ -z "$BRANCH" ]; then
            echo "::error::ветки задачи нет — сливать нечего"
            echo "merged=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi
-          git fetch -q origin dev
-          git checkout -q -B merge-into-dev "origin/$BRANCH"
+          git fetch -q origin dev "$BRANCH"
+          # #312: сливается только проверенный код. Допустимые вершины ветки:
+          # сам SHA материала либо он же плюс ровно один коммит публикации
+          # документа ревью (дифф только docs/reviews/). Любой другой коммит —
+          # ветка уехала после ревью, вердикт к ней не применим: возврат в
+          # S6-in-progress через merged=false, как при конфликте.
+          actual=$(git rev-parse "origin/$BRANCH")
+          reviewed="$MATERIAL_SHA"
+          fresh=false
+          if [ "$actual" = "$reviewed" ]; then
+            fresh=true
+          elif [ "$(git rev-parse "$actual^" 2>/dev/null)" = "$reviewed" ] \
+            && [ -z "$(git diff --name-only "$reviewed" "$actual" -- . ':!docs/reviews')" ]; then
+            fresh=true
+          fi
+          if [ "$fresh" != true ]; then
+            echo "merged=false" >> "$GITHUB_OUTPUT"
+            echo "::warning::ветка $BRANCH уехала после проверенного SHA $reviewed (сейчас $actual) — слияние отменено (#312)"
+            cat > /tmp/stale-verdict.md <<EOF
+          **Слияние отменено: ветка изменилась после проверенного материала (#312).**
+
+          Ревью выполнялось на \\`$(git rev-parse --short "$reviewed")\\`, а вершина ветки сейчас \\`$(git rev-parse --short "$actual")\\` — в ней есть коммиты, которых вердикт не покрывает. Зелёный вердикт остаётся в силе только для проверенного SHA.
+
+          Задача переведена в \\`S6-in-progress\\`. Дальше: убедиться, что вершина ветки — именно то, что должно ехать в dev, и вернуть метку \\`S7-code-review\\` — новый заход ревью проверит актуальный код.
+          EOF
+            gh issue comment "$NUM" --repo "${{ github.repository }}" --body-file /tmp/stale-verdict.md
+            exit 0
+          fi
+          git checkout -q -B merge-into-dev "$actual"
          if ! git -c user.name="claude[bot]" \
                   -c user.email="209825114+claude[bot]@users.noreply.github.com" \
                   rebase origin/dev; then
@@ -1,4 +1,4 @@
-name: Publish prerelease
+name: Публикация пре-релиза (ручная)
 run-name: Publish ${{ inputs.tag }}

 on:
@@ -19,6 +19,7 @@ concurrency:

 jobs:
  gate:
+    name: "Гейт: зелёная Проверка и релизный контракт"
    runs-on: ubuntu-latest
    outputs:
      sha: ${{ steps.candidate.outputs.sha }}
@@ -61,6 +62,7 @@ jobs:
        run: node scripts/release-gate.mjs "$SHA"

  publish:
+    name: Публикация тега и релиза
    needs: gate
    runs-on: ubuntu-latest
    outputs:
@@ -198,6 +200,7 @@ jobs:
  # A manual step after a successful release is the worst kind: by the time it is
  # due, the work already looks finished, which is exactly why it gets forgotten.
  close-merged:
+    name: Закрытие вошедших issue
    needs: [gate, publish]
    if: ${{ needs.publish.outputs.newly_published == 'true' }}
    runs-on: ubuntu-latest
@@ -245,6 +248,7 @@ jobs:
          }

  announce:
+    name: Комментарий о публикации
    needs: [gate, publish]
    if: ${{ needs.publish.outputs.newly_published == 'true' }}
    uses: ./.github/workflows/announce.yml
@@ -1,4 +1,4 @@
-name: Attach HACS zip to release
+name: HACS-zip к релизу
 # hacs.json declares zip_release + filename=houseplan.zip, so every release
 # (prereleases included) must carry the asset — HACS installs from it and
 # GitHub's public download counter becomes a free per-version install metric
@@ -19,6 +19,7 @@ permissions:
  contents: write
 jobs:
  zip:
+    name: Собрать houseplan.zip и приложить к релизу
    runs-on: ubuntu-latest
    steps:
      - name: Resolve tag
@@ -1,4 +1,4 @@
-name: Release
+name: "Релиз: ассеты после зелёной проверки"
 on:
  release:
    types: [published]
@@ -14,6 +14,7 @@ jobs:
  # Needs a push with a token that has the `workflow` scope (the ordinary
  # Personal Access Token used for `git push` refuses workflow file updates).
  gate:
+    name: "Гейт: зелёная Проверка точного SHA тега"
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
@@ -42,8 +43,9 @@ jobs:
        run: |
          set -euo pipefail
          SHA=$(git rev-parse HEAD)
-          node scripts/release-gate.mjs "$SHA" --workflow=performance.yml --label="Full Performance"
+          node scripts/release-gate.mjs "$SHA" --workflow=performance.yml --label="Полные бенчмарки производительности"
  build:
+    name: Сборка бандла и загрузка ассетов
    needs: gate
    runs-on: ubuntu-latest
    steps:
@@ -71,6 +73,7 @@ jobs:
        with:
          files: dist/houseplan-card.js
  hacs-discovery:
+    name: HACS-видимость пре-релиза (порядок бет)
    # HACS 2.0.x takes the first prerelease in GitHub's response instead of
    # sorting SemVer. A valid asset can therefore be invisible to beta users
    # (beta.10 appeared after beta.9). Keep the release asset, but
@@ -1,4 +1,4 @@
-name: Validate
+name: Проверка (CI)

 on:
  push:
@@ -22,6 +22,7 @@ concurrency:

 jobs:
  docs:
+    name: "Документация: гайды, ченджлоги, скриншот-индекс"
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
@@ -34,6 +35,7 @@ jobs:
  # совпадать в `main` и `dev`. До этой проверки совпадение держалось на
  # дисциплине: каждая правка требовала двух пушей и ручной сверки.
  process-workflow-sync:
+    name: "Процесс: process.yml идентичен в main и dev"
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
@@ -53,6 +55,7 @@ jobs:
          fi

  provenance:
+    name: "Провенанс коммитов: трейлеры и эталоны"
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
@@ -76,6 +79,7 @@ jobs:
  # где нарушение правила №1 ловится машиной. Job независимый: краснеет сам и
  # не роняет остальные, откат — удалить его отсюда, скрипт остаётся рабочим.
  process-gate:
+    name: "Процессный гейт: диапазон, трейлеры, статусы issue"
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
@@ -104,6 +108,7 @@ jobs:
  # экономят на ветках задач, где Validate — ранний сигнал: настоящую приёмку
  # там делает код-ревью, которое гоняет гейты само (#127).
  changes:
+    name: Классификация изменённых файлов
    runs-on: ubuntu-latest
    outputs:
      frontend: ${{ steps.classify.outputs.frontend }}
@@ -158,6 +163,7 @@ jobs:
  # CARD_VERSION и package.json входят в фингерпринт, поэтому ключи кандидата
  # заведомо новые и полный набор гейтов перед бетой и релизом идёт всегда.
  reuse:
+    name: "Переиспользование: это дерево уже проверено"
    runs-on: ubuntu-latest
    outputs:
      smoke: ${{ steps.probe.outputs.smoke }}
@@ -237,6 +243,7 @@ jobs:
          waive backend "$BACKEND"

  hacs:
+    name: "HACS: валидация репозитория"
    needs: changes
    if: needs.changes.outputs.integration == 'true'
    runs-on: ubuntu-latest
@@ -248,6 +255,7 @@ jobs:
          category: integration

  hassfest:
+    name: "Hassfest: манифест интеграции"
    needs: changes
    if: needs.changes.outputs.integration == 'true'
    runs-on: ubuntu-latest
@@ -257,6 +265,7 @@ jobs:
        uses: home-assistant/actions/hassfest@master

  frontend:
+    name: "Фронтенд: типы, юниты, мутанты, синхрон бандла"
    needs: changes
    if: needs.changes.outputs.frontend == 'true'
    runs-on: ubuntu-latest
@@ -278,6 +287,7 @@ jobs:
        run: cmp dist/houseplan-card.js custom_components/houseplan/frontend/houseplan-card.js

  smoke:
+    name: Смоки в браузере (шард ${{ matrix.shard }} из 3)
    # Gated on `frontend` so a typecheck failure does not burn browser minutes.
    needs: [frontend, reuse]
    if: needs.reuse.outputs.smoke != 'true'
@@ -350,6 +360,7 @@ jobs:
  # Маркер переиспользования пишется ОДИН раз и только когда прошли все шарды:
  # частично прогнанная матрица не имеет права выглядеть как выполненная работа.
  smoke_done:
+    name: "Смоки: все шарды зелёные"
    needs: [smoke, reuse]
    if: needs.reuse.outputs.smoke != 'true'
    runs-on: ubuntu-latest
@@ -370,6 +381,7 @@ jobs:
          key: reuse-smoke-${{ needs.reuse.outputs.smoke_key }}

  golden:
+    name: Golden-кадры против принятых эталонов
    # Deterministic visual correctness stays in every prerelease gate: it is
    # inexpensive and catches a different class of regressions than timings.
    needs: [frontend, reuse]
@@ -432,6 +444,7 @@ jobs:
          key: reuse-golden-${{ needs.reuse.outputs.golden_key }}

  performance_smoke:
+    name: "Перф-смок: бюджет времени кадра"
    # Candidate-only catastrophic-regression guard for ordinary pushes and
    # prereleases. The expensive same-runner comparison lives in performance.yml.
    needs: [frontend, reuse]
@@ -494,6 +507,7 @@ jobs:
          key: reuse-performance_smoke-${{ needs.reuse.outputs.performance_smoke_key }}

  backend:
+    name: "Бэкенд: pytest в Home Assistant"
    needs: [changes, reuse]
    if: needs.changes.outputs.backend == 'true' && needs.reuse.outputs.backend != 'true'
    runs-on: ubuntu-latest
@@ -194,6 +194,12 @@ S1-new → S2-analysis → S3-spec → S4-spec-review ⟲ → S5-ready →
 - **High блокируют.** Medium **в скоупе задачи** чинится в текущем issue:
  без High это жёлтый вердикт и возврат автору, фикс проходит повторный цикл.
  Medium **вне скоупа** — отдельный issue (#202).
+- **Вердикт привязан к SHA (#312).** Все числа и факты отчёта сверяются с
+  `git rev-parse HEAD` непосредственно перед подведением итогов, а не с SHA,
+  зафиксированным в начале разбора: во время ревью в ветку может прилететь
+  fix-up. Серверный стопор — шаг слияния конвейера сверяет вершину ветки с
+  SHA материала ревью (допустим только собственный doc-коммит публикации
+  поверх) и при расхождении отменяет слияние с возвратом в `S6-in-progress`.
 - **Выход:** очередь на пре-релиз либо возврат в «В разработке», не более
  4 циклов (§4). Второй и последующие циклы разбираются по дельте (§2.10).

@@ -281,7 +287,9 @@ S1-new → S2-analysis → S3-spec → S4-spec-review ⟲ → S5-ready →
   правка. Блокирующая находка отправляет текущий issue в «Заблокировано».
 10. **Каждый коммит класса A и B несёт трейлер `Issue: #NN`**, ветка называется
    `issue/NN-slug`, а `User-Visible: yes` требует правок в **обоих** changelog в
-    том же коммите.
+    том же коммите. После `cherry-pick -x` служебная строка `(cherry picked
+    from ...)` должна оставаться выше финального блока трейлеров: перед push
+    проверяем порядок через `git show -s --format=full HEAD`.
 11. **Документация — в том же коммите, что поведение.** Отдельным «допишу потом»
    коммитом документация не бывает.
 12. **Сгенерированное не коммитится само по себе.** Только релизный промоушен или
@@ -1,6 +1,6 @@
 # 🏠 House Plan — a live home map for Home Assistant

-[![HACS Custom](https://img.shields.io/badge/HACS-Custom-41BDF5.svg)](https://github.com/hacs/integration)
+[![HACS Default](https://img.shields.io/badge/HACS-Default-41BDF5.svg)](https://github.com/hacs/integration)
 [![GitHub release](https://img.shields.io/github/v/release/Matysh/houseplan-card)](https://github.com/Matysh/houseplan-card/releases)
 [![CI](https://github.com/Matysh/houseplan-card/actions/workflows/validate.yml/badge.svg)](https://github.com/Matysh/houseplan-card/actions)
 [![Live demo](https://img.shields.io/badge/demo-try_it_live-00c853?logo=homeassistant&logoColor=white)](https://demo.houseplan.tech)
@@ -88,10 +88,11 @@ The [Background editor contract](docs/DECOR-EDITOR.md) and

 [![Open the repository in HACS](https://my.home-assistant.io/badges/hacs_repository.svg)](https://my.home-assistant.io/redirect/hacs_repository/?owner=Matysh&repository=houseplan-card&category=integration)

-1. In HACS open **⋮ → Custom repositories**.
-2. Add `https://github.com/Matysh/houseplan-card` as an **Integration**.
-3. Install House Plan and restart Home Assistant.
-4. Open **Settings → Devices & services → Add integration → House Plan**.
+House Plan is in the HACS default catalog — no custom repository needed.
+
+1. In HACS search for **House Plan** and install it.
+2. Restart Home Assistant.
+3. Open **Settings → Devices & services → Add integration → House Plan**.

 The card is registered automatically. If you manage Lovelace resources
 manually, use the URL served by the integration:
@@ -1,6 +1,6 @@
 # 🏠 House Plan — живой план дома для Home Assistant

-[![HACS Custom](https://img.shields.io/badge/HACS-Custom-41BDF5.svg)](https://github.com/hacs/integration)
+[![HACS Default](https://img.shields.io/badge/HACS-Default-41BDF5.svg)](https://github.com/hacs/integration)
 [![GitHub release](https://img.shields.io/github/v/release/Matysh/houseplan-card)](https://github.com/Matysh/houseplan-card/releases)
 [![CI](https://github.com/Matysh/houseplan-card/actions/workflows/validate.yml/badge.svg)](https://github.com/Matysh/houseplan-card/actions)
 [![Live demo](https://img.shields.io/badge/демо-попробовать-00c853?logo=homeassistant&logoColor=white)](https://demo.houseplan.tech)
@@ -91,10 +91,12 @@ Assistant — и устройства появятся на плане авто

 [![Открыть репозиторий в HACS](https://my.home-assistant.io/badges/hacs_repository.svg)](https://my.home-assistant.io/redirect/hacs_repository/?owner=Matysh&repository=houseplan-card&category=integration)

-1. В HACS откройте **⋮ → Пользовательские репозитории**.
-2. Добавьте `https://github.com/Matysh/houseplan-card` с типом **Интеграция**.
-3. Установите House Plan и перезапустите Home Assistant.
-4. Откройте **Настройки → Устройства и службы → Добавить интеграцию → House Plan**.
+House Plan входит в основной каталог HACS — пользовательский репозиторий
+добавлять не нужно.
+
+1. Найдите **House Plan** в поиске HACS и установите.
+2. Перезапустите Home Assistant.
+3. Откройте **Настройки → Устройства и службы → Добавить интеграцию → House Plan**.

 Карточка регистрируется автоматически. Если ресурсы Lovelace управляются вручную,
 добавьте именно URL, который публикует интеграция:
@@ -46,12 +46,12 @@ PLAN_ORPHAN_TTL_S = 3600
 SCHEDULED_GRACE_S = 30 * 24 * 3600
 FILES_DIR = "houseplan/files"
 CONF_ADMIN_ONLY = "admin_only"
-VERSION = "1.67.0-rc.3"
+VERSION = "1.68.1"

 # Portable backup format.  This is deliberately independent from the Home
 # Assistant Store version above: storage migrations and files exported by a
 # user have different compatibility lifecycles.
-PLAN_MODEL_VERSION = 7
+PLAN_MODEL_VERSION = 9
 EXPORT_VERSION = 1
 MAX_EXPORT_BYTES = 8 * 1024 * 1024
 IMPORT_PREVIEW_TTL_S = 10 * 60
@@ -136,6 +136,10 @@ def canonicalize_config_geometry(config: Any) -> Any:
            _lattice_point(wall.get("a"))
            _lattice_point(wall.get("b"))

+        for segment in _records(space.get("wall_segments")):
+            _lattice_point(segment.get("a"))
+            _lattice_point(segment.get("b"))
+
        for opening in _records(space.get("openings")):
            _lattice_fields(opening, ("x", "y"))
            _scalar_fields(opening, ("angle", "length"))
@@ -36,6 +36,10 @@ from .const import (
    VERSION,
 )
 from .store import HouseplanData
+from .wall_segment_model import (
+    WallSegmentMigrationError,
+    commit_wall_segment_model,
+)
 from .validation import (
    CONFIG_SCHEMA,
    LAYOUT_SCHEMA,
@@ -64,7 +68,8 @@ _LIVE_TEXT_ENTITY = re.compile(r"^[a-z0-9_]+\.[a-z0-9_]+$")
 _LIVE_TEXT_ATTRIBUTE = re.compile(r"^[a-zA-Z0-9_.-]+$")
 _PLAN_ONLY_DASH = "—"
 _IMPORT_ID_NAMESPACES = {
-    "space", "room", "marker", "partition", "opening", "decor", "draft", "column",
+    "space", "room", "marker", "partition", "wall", "opening", "decor", "draft",
+    "draft_segment", "column",
 }
 _MAX_IMPORT_LINEAGE_DEPTH = 16
 _REPORT_EXAMPLE_LIMIT = 24
@@ -72,6 +77,7 @@ _REPORT_EXAMPLE_LIMIT = 24
 _SPACE_PLAN_FIELDS = (
    "id", "title", "cell_cm", "plan_url", "plan_aspect", "plan_x", "plan_y",
    "plan_scale", "plan_scale_x", "plan_scale_y", "plan_angle", "view_box",
+    "zero_wall_style",
 )
 _SPACE_DISPLAY_FIELDS = (
    "show_borders", "show_names", "room_color", "bg_color", "room_opacity",
@@ -80,7 +86,7 @@ _SPACE_DISPLAY_FIELDS = (
    "label_lqi", "label_light", "card_font_scale", "north_deg", "bg_mode",
    "sun_rays",
 )
-_ROOM_PLAN_FIELDS = ("id", "name", "open_to", "x", "y", "w", "h", "poly")
+_ROOM_PLAN_FIELDS = ("id", "name", "open_to", "x", "y", "w", "h", "poly", "wall_ids")
 _ROOM_DISPLAY_FIELDS = (
    "fill_mode", "custom_fill", "glow", "name_scale", "label_scale",
 )
@@ -249,6 +255,7 @@ def _project_plan_only_space(space: dict[str, Any]) -> dict[str, Any]:
    ]
    collections: tuple[tuple[str, tuple[str, ...]], ...] = (
        ("walls", ("key", "cm", "a", "b")),
+        ("wall_segments", ("id", "a", "b", "cm")),
        ("room_drafts", ("id", "points", "segments")),
        ("partitions", ("id", "a", "b", "cm")),
        ("wall_columns", ("id", "shape", "center", "cm", "angle")),
@@ -262,7 +269,7 @@ def _project_plan_only_space(space: dict[str, Any]) -> dict[str, Any]:
            selected = _pick_fields(item, fields)
            if name == "room_drafts" and "segments" in selected:
                selected["segments"] = [
-                    _pick_fields(segment, ("cm",))
+                    _pick_fields(segment, ("id", "cm"))
                    for segment in selected.get("segments") or []
                ]
            values.append(selected)
@@ -584,7 +591,14 @@ def parse_document(raw: bytes) -> dict[str, Any]:
    if not isinstance(payload, dict):
        raise ImportFailure("invalid_format", "Missing payload")
    try:
-        config = CONFIG_SCHEMA(_json_copy(payload.get("config")))
+        config_candidate = _json_copy(payload.get("config"))
+        # The envelope is authoritative. Export deliberately omits this field
+        # inside payload.config, but v8 semantic validation still has to run
+        # before an import token can be issued.
+        if model > 0:
+            config_candidate["model_version"] = model
+        config = CONFIG_SCHEMA(config_candidate)
+        config.pop("model_version", None)
    except (vol.Invalid, TypeError, ValueError) as err:
        raise ImportFailure("invalid_config", str(err)) from err
    if document["kind"] == "full":
@@ -1154,7 +1168,8 @@ def build_space_merge(
        for sp in current_config.get("spaces") or []
        for collection in (
            (sp,), sp.get("rooms") or [], sp.get("room_drafts") or [],
-            sp.get("partitions") or [], sp.get("wall_columns") or [],
+            sp.get("partitions") or [], sp.get("wall_segments") or [],
+            sp.get("wall_columns") or [],
            sp.get("openings") or [], sp.get("decor") or [],
        )
        for item in collection
@@ -1164,13 +1179,19 @@ def build_space_merge(
    } | {
        str(m.get("id")) for m in current_config.get("markers") or []
        if m.get("id") is not None
+    } | {
+        str(segment.get("id"))
+        for sp in current_config.get("spaces") or []
+        for draft in sp.get("room_drafts") or []
+        for segment in draft.get("segments") or []
+        if isinstance(segment, dict) and segment.get("id") is not None
    } | {
        str(value)
        for incoming_space in spaces
        for collection in (
            (incoming_space,), incoming_space.get("rooms") or [],
            incoming_space.get("room_drafts") or [],
-            incoming_space.get("partitions") or [],
+            incoming_space.get("partitions") or [], incoming_space.get("wall_segments") or [],
            incoming_space.get("wall_columns") or [],
            incoming_space.get("openings") or [], incoming_space.get("decor") or [],
        )
@@ -1181,6 +1202,12 @@ def build_space_merge(
    } | {
        str(m.get("id")) for m in incoming.get("markers") or []
        if m.get("id") is not None
+    } | {
+        str(segment.get("id"))
+        for incoming_space in spaces
+        for draft in incoming_space.get("room_drafts") or []
+        for segment in draft.get("segments") or []
+        if isinstance(segment, dict) and segment.get("id") is not None
    }
    old_space_id = str(space.get("id"))
    _record_bounded_lineage(
@@ -1194,6 +1221,7 @@ def build_space_merge(
    id_maps["space"][old_space_id] = new_space_id
    for collection, prefix in (
        ("rooms", "room"), ("room_drafts", "draft"), ("partitions", "partition"),
+        ("wall_segments", "wall"),
        ("wall_columns", "column"), ("openings", "opening"), ("decor", "decor"),
    ):
        for item in space.get(collection) or []:
@@ -1205,6 +1233,18 @@ def build_space_merge(
                id_map[old] = _fresh(prefix, old, used)
                id_maps[prefix][old] = id_map[old]
                item["id"] = id_map[old]
+    for draft in space.get("room_drafts") or []:
+        for segment in draft.get("segments") or []:
+            if not isinstance(segment, dict) or segment.get("id") is None:
+                continue
+            old = str(segment["id"])
+            _record_bounded_lineage(
+                reference_report, bounded_seen, "draft_segment", old,
+            )
+            new = _fresh("draft_segment", old, used)
+            id_map[old] = new
+            id_maps["draft_segment"][old] = new
+            segment["id"] = new
    old_room_ids = id_maps["room"]
    for room in space.get("rooms") or []:
        if room.get("open_to"):
@@ -1219,13 +1259,18 @@ def build_space_merge(
                        str(room.get("id", "?")), old_value,
                    )
            room["open_to"] = remapped_open_to
+        if room.get("wall_ids"):
+            room["wall_ids"] = [
+                id_maps["wall"].get(str(value), str(value))
+                for value in room["wall_ids"]
+            ]
    # Opening ownership is part of the same space-local id graph. Remap the
    # nested reference together with the partition itself; otherwise the
    # invariant validator correctly rejects a copied space whose host.id still
    # names the source partition.
    for opening in space.get("openings") or []:
        host = opening.get("host") if isinstance(opening, dict) else None
-        if isinstance(host, dict) and host.get("kind") == "partition":
+        if isinstance(host, dict) and host.get("kind") in ("partition", "wall"):
            old_host_id = str(host.get("id"))
            if old_host_id in id_map:
                host["id"] = id_map[old_host_id]
@@ -1591,6 +1636,22 @@ def _materialize_import_candidate(
    imported_config = prepared["payload"]["config"]
    if confirmation_required:
        _detach_missing(imported_config, content)
+    incoming_model = int(prepared.get("model_version", 0) or 0)
+    target_model = int(current_config.get("model_version", 0) or 0)
+    requires_v8 = incoming_model >= 8 or target_model >= 8
+    if requires_v8:
+        try:
+            # A v8 target cannot be downgraded by a v7 backup, while an
+            # incoming v8 graph must retain its already-persisted IDs. When
+            # both sides are v7 the accepted compatibility contract keeps the
+            # import v7 until a later structural write or explicit Optimize.
+            imported_config["model_version"] = incoming_model
+            imported_config, _ = commit_wall_segment_model(imported_config)
+            prepared["payload"]["config"] = imported_config
+            if prepared["kind"] == "space":
+                current_config, _ = commit_wall_segment_model(current_config)
+        except WallSegmentMigrationError as err:
+            raise ImportFailure(err.code, str(err)) from err
    if prepared["kind"] == "space":
        config, layout, details = build_space_merge(
            prepared, current_config, current_layout, duplicate_policy,
@@ -1598,11 +1659,9 @@ def _materialize_import_candidate(
        )
    else:
        config = imported_config
+        if not requires_v8 and incoming_model > 0:
+            config["model_version"] = incoming_model
        _materialize_global_background(config)
-        model_version = prepared.get("model_version", 0)
-        if isinstance(model_version, int) and not isinstance(model_version, bool) \
-                and model_version > 0:
-            config["model_version"] = model_version
        layout = _json_copy(prepared["payload"]["layout"])
        if not same_source:
            settings = config.get("settings") or {}
@@ -16,5 +16,5 @@
  "issue_tracker": "https://github.com/Matysh/houseplan-card/issues",
  "requirements": [],
  "single_config_entry": true,
-  "version": "1.67.0-rc.3"
+  "version": "1.68.1"
 }
@@ -5,6 +5,7 @@ Kept separate so it can be covered by unit tests (only voluptuous is needed).
 from __future__ import annotations

 from collections import Counter
+import copy
 import math
 import re

@@ -77,6 +78,137 @@ class PartitionOpeningJambMarginError(ValueError):
        )


+class WallModelClientOutdatedError(ValueError):
+    """A stale client tried to replace an already-migrated v8 document."""
+
+    code = "wall_model_client_outdated"
+
+
+def _legacy_wall_model_projection(config: dict) -> dict:
+    """Structural view an older client can faithfully round-trip."""
+    projected = copy.deepcopy(config)
+    projected.pop("model_version", None)
+    for space in projected.get("spaces") or []:
+        space.pop("wall_segments", None)
+        for room in space.get("rooms") or []:
+            room.pop("wall_ids", None)
+        for draft in space.get("room_drafts") or []:
+            for segment in draft.get("segments") or []:
+                segment.pop("id", None)
+        for opening in space.get("openings") or []:
+            host = opening.get("host")
+            if isinstance(host, dict) and host.get("kind") == "wall":
+                opening.pop("host", None)
+    return projected
+
+
+def _catalog_coupled_wall_geometry_projection(config: dict) -> list[dict]:
+    """Legacy geometry whose edit must also update the v8 contour catalogue.
+
+    Drafts, partitions and columns carry their own ids. Openings carry an
+    explicit v8 host and are checked against it by CONFIG_SCHEMA. None of those
+    independent objects requires a different contour wall_segments catalogue.
+    """
+    result: list[dict] = []
+    for space in config.get("spaces") or []:
+        rooms = []
+        for room in space.get("rooms") or []:
+            rooms.append({key: copy.deepcopy(room.get(key)) for key in (
+                "id", "poly", "x", "y", "w", "h", "open_to"
+            ) if key in room})
+        result.append({
+            "id": space.get("id"),
+            "rooms": rooms,
+            "walls": copy.deepcopy(space.get("walls") or []),
+            "open_spans": copy.deepcopy(space.get("open_spans") or []),
+        })
+    return result
+
+
+def _wall_catalog_projection(config: dict) -> list[dict]:
+    """Authoritative part a current v8 structural writer must update."""
+    return [{
+        "id": space.get("id"),
+        "wall_segments": copy.deepcopy(space.get("wall_segments")),
+    } for space in config.get("spaces") or []]
+
+
+def _restore_wall_model_fields(config: dict, previous: dict) -> None:
+    """Hydrate only v8 identity fields after an exact legacy round-trip."""
+    config["model_version"] = previous["model_version"]
+    old_spaces = {str(space.get("id")): space for space in previous.get("spaces") or []}
+    for space in config.get("spaces") or []:
+        old_space = old_spaces.get(str(space.get("id")))
+        if old_space is None:
+            continue
+        space["wall_segments"] = copy.deepcopy(old_space.get("wall_segments") or [])
+        old_rooms = {str(room.get("id")): room for room in old_space.get("rooms") or []}
+        for room in space.get("rooms") or []:
+            old_room = old_rooms.get(str(room.get("id")))
+            if old_room is not None and "wall_ids" in old_room:
+                room["wall_ids"] = copy.deepcopy(old_room["wall_ids"])
+        old_drafts = {str(draft.get("id")): draft for draft in old_space.get("room_drafts") or []}
+        for draft in space.get("room_drafts") or []:
+            old_draft = old_drafts.get(str(draft.get("id")))
+            if old_draft is None:
+                continue
+            old_segments = old_draft.get("segments") or []
+            for index, segment in enumerate(draft.get("segments") or []):
+                if index < len(old_segments) and old_segments[index].get("id"):
+                    segment["id"] = old_segments[index]["id"]
+        old_openings = {
+            str(opening.get("id")): opening for opening in old_space.get("openings") or []
+        }
+        for opening in space.get("openings") or []:
+            old_opening = old_openings.get(str(opening.get("id")))
+            old_host = (old_opening or {}).get("host")
+            if isinstance(old_host, dict) and old_host.get("kind") == "wall":
+                opening["host"] = copy.deepcopy(old_host)
+
+
+def validate_wall_model_transition(config: dict, previous: dict | None) -> None:
+    """Do not let omission of model_version bypass v8 semantic validation."""
+    try:
+        old_model = int((previous or {}).get("model_version", 0))
+        new_model = int(config.get("model_version", 0))
+    except (TypeError, ValueError):
+        return  # CONFIG_SCHEMA owns malformed values.
+    previous = previous or {}
+    contour_geometry_changed = (
+        _catalog_coupled_wall_geometry_projection(config)
+        != _catalog_coupled_wall_geometry_projection(previous)
+    )
+    if old_model >= 8 and new_model < 8:
+        if not contour_geometry_changed:
+            _restore_wall_model_fields(config, previous or {})
+            # Re-run semantic parity after hydration; previous identity is
+            # accepted only when it still matches the submitted projections.
+            validated = CONFIG_SCHEMA(config)
+            config.clear()
+            config.update(validated)
+            return
+        raise WallModelClientOutdatedError(
+            f"stored model={old_model}; submitted model={new_model}"
+        )
+    if old_model >= 8 and 8 <= new_model <= old_model and contour_geometry_changed:
+        # The realistic stale-client case echoes model_version and the unknown
+        # catalogue verbatim while changing room/contour geometry. Let the
+        # frontend show the dedicated reload guidance instead of a generic
+        # schema error. Independent drafts, partitions, columns and explicitly
+        # hosted openings are validated by CONFIG_SCHEMA without requiring a
+        # contour catalogue change (#314).
+        #
+        # A submitted model ABOVE the stored one is excluded on purpose (#319):
+        # a stale client can only echo the stored version, never raise it. The
+        # first write of a newer client legitimately drops legacy projection
+        # fields (an orphan open_span/open_to) without touching the catalogue;
+        # treating that as "outdated" wedged every structural write forever.
+        if _wall_catalog_projection(config) == _wall_catalog_projection(previous):
+            raise WallModelClientOutdatedError(
+                f"stored model={old_model}; unchanged wall catalogue"
+            )
+
+
 # One normalized canvas width contains this many physical grid cells. Keep in
 # sync with GRID_STEP_N/NORM_W in the frontend; it is a geometry scale, not a
 # user setting.
@@ -520,34 +652,39 @@ def validate_partition_opening_hosts(
        for opening in space.get("openings") or []:
            opening_id = str(opening.get("id", ""))
            old = old_openings.get(opening_id)
-            if old and old.get("host") is not None and opening.get("host") is None:
-                if not (allow_optimize_rehost and old_space
-                        and _safe_optimize_partition_rehost(
-                            space, old_space, opening, old
-                        )):
-                    raise PartitionOpeningHostError(
-                        f"space={space_id}; opening={opening_id}; host removed"
-                    )
+            old_host = (old or {}).get("host")
            host = opening.get("host")
+            if (old and isinstance(old_host, dict)
+                    and old_host.get("kind") == "partition"):
+                same_partition = (
+                    isinstance(host, dict) and host.get("kind") == "partition"
+                    and str(host.get("id", "")) == str(old_host.get("id", ""))
+                )
+                residual_rehost = (
+                    isinstance(host, dict) and host.get("kind") == "partition"
+                    and not same_partition
+                )
+                proved = same_partition or (
+                    allow_optimize_rehost and old_space is not None
+                    and (_safe_optimize_residual_rehost(
+                        space, old_space, opening, old
+                    ) if residual_rehost else _safe_optimize_partition_rehost(
+                        space, old_space, opening, old
+                    ))
+                )
+                if not proved:
+                    raise PartitionOpeningHostError(
+                        f"space={space_id}; opening={opening_id}; host changed"
+                    )
            if host is None:
                continue
+            if host.get("kind") != "partition":
+                continue
            partition = partitions.get(str(host.get("id", "")))
            if partition is None:
                # SPACE_SCHEMA owns missing-host diagnostics.
                continue
-            old_host = (old or {}).get("host")
            old_partition = old_partitions.get(str((old_host or {}).get("id", "")))
-            if (allow_optimize_rehost and old and old_space
-                    and isinstance(old_host, dict)
-                    and old_host.get("kind") == "partition"
-                    and isinstance(host, dict) and host.get("kind") == "partition"
-                    and old_host.get("id") != host.get("id")
-                    and not _safe_optimize_residual_rehost(
-                        space, old_space, opening, old
-                    )):
-                raise PartitionOpeningHostError(
-                    f"space={space_id}; opening={opening_id}; residual host changed"
-                )
            ax, ay = partition["a"]
            bx, by = partition["b"]
            span = ((bx - ax) ** 2 + (by - ay) ** 2) ** 0.5
@@ -910,7 +1047,11 @@ MAX_ROOMS = 400
 MAX_MARKERS = 2000
 MAX_OPENINGS = 500
 MAX_DECOR = 1000
-MAX_WALLS = 500
+# v8 atomises room boundaries. The 2 MiB wire cap is the practical bound; this
+# structural cap mirrors MAX_ROOMS * MAX_POLY_POINTS without depending on the
+# later constant declaration.
+MAX_WALLS = 200_000
+MAX_WALL_SEGMENTS = 200_000
 MAX_ROOM_DRAFTS = 200
 MAX_DRAFT_SEGMENTS = 2000
 MAX_PARTITIONS = 2000
@@ -1075,6 +1216,10 @@ ROOM_SCHEMA = vol.All(
            vol.Optional("w"): _EXTENT,
            vol.Optional("h"): _EXTENT,
            vol.Optional("poly"): vol.All([POINT], vol.Length(min=3, max=MAX_POLY_POINTS)),
+            vol.Optional("wall_ids"): vol.All(
+                [vol.All(str, vol.Length(min=1, max=64))],
+                vol.Length(min=3, max=MAX_POLY_POINTS),
+            ),
        },
        extra=vol.ALLOW_EXTRA,
    ),
@@ -1246,6 +1391,26 @@ WALL_SCHEMA = vol.All(
 )


+def _wall_segment_nonzero(value: dict) -> dict:
+    if value["a"] == value["b"]:
+        raise vol.Invalid("wall segment endpoints must differ")
+    return value
+
+
+WALL_SEGMENT_SCHEMA = vol.All(
+    vol.Schema(
+        {
+            vol.Required("id"): vol.All(str, vol.Length(min=1, max=64)),
+            vol.Required("a"): POINT,
+            vol.Required("b"): POINT,
+            vol.Required("cm"): vol.All(_finite, vol.Range(min=0, max=100)),
+        },
+        extra=vol.ALLOW_EXTRA,
+    ),
+    _wall_segment_nonzero,
+)
+
+
 def _room_draft_segments(value: dict) -> dict:
    """An open draft has exactly one thickness per consecutive edge."""
    if len(value.get("segments", [])) != max(0, len(value.get("points", [])) - 1):
@@ -1261,7 +1426,10 @@ ROOM_DRAFT_SCHEMA = vol.All(
            vol.Required("id"): vol.All(str, vol.Length(min=1, max=64)),
            vol.Required("points"): vol.All([POINT], vol.Length(min=2, max=500)),
            vol.Required("segments"): vol.All(
-                [vol.Schema({vol.Required("cm"): vol.All(_finite, vol.Range(min=1, max=100))},
+                [vol.Schema({
+                    vol.Optional("id"): vol.All(str, vol.Length(min=1, max=64)),
+                    vol.Required("cm"): vol.All(_finite, vol.Range(min=0, max=100)),
+                },
                            extra=vol.ALLOW_EXTRA)],
                vol.Length(min=1, max=499),
            ),
@@ -1283,7 +1451,7 @@ PARTITION_SCHEMA = vol.All(
            vol.Required("id"): vol.All(str, vol.Length(min=1, max=64)),
            vol.Required("a"): POINT,
            vol.Required("b"): POINT,
-            vol.Required("cm"): vol.All(_finite, vol.Range(min=1, max=100)),
+            vol.Required("cm"): vol.All(_finite, vol.Range(min=0, max=100)),
        },
        extra=vol.ALLOW_EXTRA,
    ),
@@ -1325,11 +1493,22 @@ PARTITION_OPENING_HOST_SCHEMA = vol.Schema(
    extra=vol.PREVENT_EXTRA,
 )

+WALL_OPENING_HOST_SCHEMA = vol.Schema(
+    {
+        vol.Required("kind"): vol.Equal("wall"),
+        vol.Required("id"): vol.All(str, vol.Length(min=1, max=64)),
+        vol.Required("t"): vol.All(_finite, vol.Range(min=0, max=1)),
+    },
+    extra=vol.PREVENT_EXTRA,
+)
+
+OPENING_HOST_SCHEMA = vol.Any(PARTITION_OPENING_HOST_SCHEMA, WALL_OPENING_HOST_SCHEMA)
+

 def _space_geometry_invariants(value: dict) -> dict:
    """All stored geometry shares ids; draft segments also have a space cap."""
    seen: set[str] = set()
-    for key in ("rooms", "openings", "decor", "room_drafts", "partitions", "wall_columns"):
+    for key in ("rooms", "openings", "decor", "room_drafts", "partitions", "wall_columns", "wall_segments"):
        for item in value.get(key, []):
            item_id = item.get("id")
            if not item_id:
@@ -1342,6 +1521,14 @@ def _space_geometry_invariants(value: dict) -> dict:
    )
    if draft_segments > MAX_DRAFT_SEGMENTS:
        raise vol.Invalid("too many saved room-draft segments")
+    for draft in value.get("room_drafts", []):
+        for segment in draft.get("segments", []):
+            segment_id = segment.get("id")
+            if not segment_id:
+                continue
+            if segment_id in seen:
+                raise vol.Invalid("geometry object ids must be unique within a space")
+            seen.add(segment_id)
    partitions = {
        item.get("id"): item for item in value.get("partitions", []) if item.get("id")
    }
@@ -1350,6 +1537,8 @@ def _space_geometry_invariants(value: dict) -> dict:
        host = opening.get("host")
        if host is None:
            continue
+        if host["kind"] != "partition":
+            continue
        partition = partitions.get(host["id"])
        if partition is None:
            raise vol.Invalid("partition opening host must exist in the same space")
@@ -1430,7 +1619,7 @@ SPACE_SCHEMA = vol.All(vol.Schema(
                    vol.Optional("invert"): bool,
                    vol.Optional("flip_h"): bool,
                    vol.Optional("flip_v"): bool,
-                    vol.Optional("host"): PARTITION_OPENING_HOST_SCHEMA,
+                    vol.Optional("host"): OPENING_HOST_SCHEMA,
                },
                extra=vol.ALLOW_EXTRA,
            )
@@ -1439,6 +1628,10 @@ SPACE_SCHEMA = vol.All(vol.Schema(
        # (midpoint + direction), thickness always in centimetres. Optional —
        # a space without `walls` validates and renders exactly as before.
        vol.Optional("walls"): vol.All([WALL_SCHEMA], vol.Length(max=MAX_WALLS)),
+        vol.Optional("wall_segments"): vol.All(
+            [WALL_SEGMENT_SCHEMA], vol.Length(max=MAX_WALL_SEGMENTS)
+        ),
+        vol.Optional("zero_wall_style"): vol.In(["dashed", "solid"]),
        vol.Optional("room_drafts"): vol.All(
            [ROOM_DRAFT_SCHEMA], vol.Length(max=MAX_ROOM_DRAFTS)
        ),
@@ -1567,9 +1760,124 @@ MARKER_SCHEMA = vol.Schema(
    },
    extra=vol.ALLOW_EXTRA,
 )
+
+
+def _canonical_segment_key(a: list, b: list) -> tuple:
+    """Endpoint-order-independent exact key after the shared canonicalizer."""
+    pa = (round(float(a[0]), 12), round(float(a[1]), 12))
+    pb = (round(float(b[0]), 12), round(float(b[1]), 12))
+    return (pa, pb) if pa <= pb else (pb, pa)
+
+
+def _config_wall_segment_invariants(value: dict) -> dict:
+    """Fail closed when a v8+ writer sends stale ids or wall projections."""
+    try:
+        model = int(value.get("model_version", 0))
+    except (TypeError, ValueError):
+        raise vol.Invalid("model_version must be an integer") from None
+    if model < 8:
+        return value
+
+    for space in value.get("spaces", []):
+        if model >= 9:
+            if "open_spans" in space or any("open_to" in room for room in space.get("rooms", [])):
+                raise vol.Invalid("v9 config must not contain legacy open boundaries")
+        segments = space.get("wall_segments")
+        if segments is None:
+            raise vol.Invalid("v8+ space requires wall_segments")
+        by_id = {segment["id"]: segment for segment in segments}
+        if len(by_id) != len(segments):
+            raise vol.Invalid("wall segment ids must be unique")
+
+        owners: dict[str, set[str]] = {segment_id: set() for segment_id in by_id}
+        for room in space.get("rooms", []):
+            poly = room.get("poly")
+            wall_ids = room.get("wall_ids")
+            if not poly or not wall_ids or len(poly) != len(wall_ids):
+                raise vol.Invalid("v8+ room wall_ids must match poly edges")
+            room_id = room["id"]
+            for index, segment_id in enumerate(wall_ids):
+                segment = by_id.get(segment_id)
+                if segment is None:
+                    raise vol.Invalid("room wall id must reference the same space")
+                edge_key = _canonical_segment_key(poly[index], poly[(index + 1) % len(poly)])
+                if edge_key != _canonical_segment_key(segment["a"], segment["b"]):
+                    raise vol.Invalid("room wall reference geometry must match its edge")
+                owners[segment_id].add(room_id)
+        if any(len(room_ids) not in (1, 2) for room_ids in owners.values()):
+            raise vol.Invalid("wall segment must have one or two room owners")
+
+        expected_walls = {
+            _canonical_segment_key(segment["a"], segment["b"]): float(segment["cm"])
+            for segment in segments if float(segment["cm"]) > 0
+        }
+        actual_walls: dict[tuple, float] = {}
+        for wall in space.get("walls", []):
+            if "a" not in wall or "b" not in wall:
+                raise vol.Invalid("wall compatibility projection requires exact endpoints")
+            key = _canonical_segment_key(wall["a"], wall["b"])
+            if key in actual_walls:
+                raise vol.Invalid("wall compatibility projection must be unique")
+            actual_walls[key] = float(wall["cm"])
+        if actual_walls != expected_walls:
+            raise vol.Invalid("wall compatibility projection must match wall_segments")
+
+        for draft in space.get("room_drafts", []):
+            if any(not segment.get("id") for segment in draft.get("segments", [])):
+                raise vol.Invalid("v8+ draft wall segments require ids")
+
+        partitions = {item["id"]: item for item in space.get("partitions", [])}
+        wall_opening_intervals: dict[str, list[tuple[float, float]]] = {}
+        for opening in space.get("openings", []):
+            host = opening.get("host")
+            if host is None:
+                # #316 §3.3: a degraded migration may leave a contour opening
+                # unhosted. It is inert (no body/tunnel/cut) and excluded from
+                # the interval checks; a later edit can re-place it.
+                continue
+            if host["kind"] == "partition":
+                if host["id"] not in partitions:
+                    raise vol.Invalid("partition opening host must exist in the same space")
+                if float(partitions[host["id"]]["cm"]) <= 0:
+                    raise vol.Invalid("opening host must have positive thickness")
+                continue
+            segment = by_id.get(host["id"])
+            if segment is None:
+                raise vol.Invalid("wall opening host must exist in the same space")
+            if float(segment["cm"]) <= 0:
+                raise vol.Invalid("opening host must have positive thickness")
+            t = float(host["t"])
+            x = float(segment["a"][0]) + (float(segment["b"][0]) - float(segment["a"][0])) * t
+            y = float(segment["a"][1]) + (float(segment["b"][1]) - float(segment["a"][1])) * t
+            if abs(x - float(opening["x"])) > 2e-8 or abs(y - float(opening["y"])) > 2e-8:
+                raise vol.Invalid("wall opening geometry must match its host")
+            expected_angle = math.degrees(math.atan2(
+                float(segment["b"][1]) - float(segment["a"][1]),
+                float(segment["b"][0]) - float(segment["a"][0]),
+            ))
+            if _angle_delta_mod_180(float(opening["angle"]), expected_angle) > 8:
+                raise vol.Invalid("wall opening angle must match its host")
+            span = ((segment["b"][0] - segment["a"][0]) ** 2
+                    + (segment["b"][1] - segment["a"][1]) ** 2) ** 0.5
+            along = t * span
+            length = float(opening["length"])
+            if length > span or along - length / 2 < -1e-9 or along + length / 2 > span + 1e-9:
+                raise vol.Invalid("wall opening must fit inside its host")
+            lo, hi = along - length / 2, along + length / 2
+            occupied = wall_opening_intervals.setdefault(host["id"], [])
+            if any(max(lo, old_lo) < min(hi, old_hi) - 1e-9
+                   for old_lo, old_hi in occupied):
+                raise vol.Invalid("wall openings must not overlap")
+            occupied.append((lo, hi))
+    return value
+
+
 CONFIG_SCHEMA = vol.All(
    vol.Schema(
        {
+            vol.Optional("model_version"): vol.All(
+                vol.Coerce(int), vol.Range(min=0, max=1_000_000)
+            ),
            vol.Required("spaces"): vol.All([SPACE_SCHEMA], vol.Length(max=MAX_SPACES)),
            vol.Optional("markers", default=list): vol.All([MARKER_SCHEMA], vol.Length(max=MAX_MARKERS)),
            vol.Optional("settings", default=dict): vol.Schema(
@@ -1604,4 +1912,5 @@ CONFIG_SCHEMA = vol.All(
        extra=vol.ALLOW_EXTRA,  # unknown (legacy) keys do not break loading
    ),
    canonicalize_config_geometry,
+    _config_wall_segment_invariants,
 )
@@ -0,0 +1,684 @@
+"""Deterministic persisted contour-wall identity (model v9, issues #282/#306).
+
+This is the backend twin of ``src/wall-segment-model.ts``.  Import preview is
+a server-side structural writer, so it cannot depend on a browser being open
+to upgrade v7 backups before validating/remapping them.
+"""
+from __future__ import annotations
+
+import base64
+import copy
+import hashlib
+import math
+import uuid
+from typing import Any
+
+from .coordinate_canonicalization import canonicalize_config_geometry
+
+
+WALL_SEGMENT_MODEL_VERSION = 9
+GRID_STEP_N = 1 / 240
+EPS = 1e-9
+
+
+class WallSegmentMigrationError(ValueError):
+    """The candidate cannot be upgraded without guessing ownership."""
+
+    code = "wall_model_migration_blocked"
+
+    def __init__(self, reason: str, detail: str = "") -> None:
+        self.reason = reason
+        super().__init__(f"{reason}: {detail}" if detail else reason)
+
+
+def _point_key(point: list[float]) -> str:
+    return f"{float(point[0]):.12f},{float(point[1]):.12f}"
+
+
+def _span_key(a: list[float], b: list[float]) -> str:
+    ka, kb = _point_key(a), _point_key(b)
+    return f"{ka}|{kb}" if ka < kb else f"{kb}|{ka}"
+
+
+def _canonical_span(a: list[float], b: list[float]) -> tuple[list[float], list[float]]:
+    left, right = ([float(a[0]), float(a[1])], [float(b[0]), float(b[1])])
+    return (left, right) if _point_key(left) <= _point_key(right) else (right, left)
+
+
+def _length(a: list[float], b: list[float]) -> float:
+    return math.hypot(float(b[0]) - float(a[0]), float(b[1]) - float(a[1]))
+
+
+def _project_t(point: list[float], a: list[float], b: list[float]) -> float:
+    dx, dy = float(b[0]) - float(a[0]), float(b[1]) - float(a[1])
+    denominator = dx * dx + dy * dy
+    if denominator <= EPS * EPS:
+        return 0
+    return ((float(point[0]) - float(a[0])) * dx
+            + (float(point[1]) - float(a[1])) * dy) / denominator
+
+
+def _distance_to_segment(point: list[float], a: list[float], b: list[float]) -> float:
+    t = max(0.0, min(1.0, _project_t(point, a, b)))
+    return math.hypot(
+        float(point[0]) - (float(a[0]) + (float(b[0]) - float(a[0])) * t),
+        float(point[1]) - (float(a[1]) + (float(b[1]) - float(a[1])) * t),
+    )
+
+
+def _collinear_overlap(
+    a: list[float], b: list[float], c: list[float], d: list[float], epsilon: float = EPS,
+) -> float:
+    dx, dy = float(b[0]) - float(a[0]), float(b[1]) - float(a[1])
+    length = math.hypot(dx, dy)
+    if length <= epsilon:
+        return 0
+    cross_c = abs((float(c[0]) - float(a[0])) * dy
+                  - (float(c[1]) - float(a[1])) * dx) / length
+    cross_d = abs((float(d[0]) - float(a[0])) * dy
+                  - (float(d[1]) - float(a[1])) * dx) / length
+    if cross_c > epsilon or cross_d > epsilon:
+        return 0
+    tc, td = _project_t(c, a, b), _project_t(d, a, b)
+    return max(0.0, min(1.0, max(tc, td)) - max(0.0, min(tc, td))) * length
+
+
+def _room_poly(room: dict[str, Any]) -> list[list[float]]:
+    poly = room.get("poly")
+    if isinstance(poly, list) and len(poly) >= 3:
+        return [[float(point[0]), float(point[1])] for point in poly]
+    if all(isinstance(room.get(key), (int, float)) and not isinstance(room.get(key), bool)
+           for key in ("x", "y", "w", "h")):
+        x, y, width, height = (float(room[key]) for key in ("x", "y", "w", "h"))
+        return [[x, y], [x + width, y], [x + width, y + height], [x, y + height]]
+    return []
+
+
+def _shared_boundaries(first: list[list[float]], second: list[list[float]]) -> list[list[float]]:
+    result: list[list[float]] = []
+    epsilon = GRID_STEP_N * 0.04
+    for index, start in enumerate(first):
+        end = first[(index + 1) % len(first)]
+        dx, dy = end[0] - start[0], end[1] - start[1]
+        length = math.hypot(dx, dy)
+        if length < epsilon:
+            continue
+        ux, uy = dx / length, dy / length
+        for other_index, other_start in enumerate(second):
+            other_end = second[(other_index + 1) % len(second)]
+            tolerance = max(epsilon, length * 1e-6)
+            distances = [
+                abs((point[0] - start[0]) * uy - (point[1] - start[1]) * ux)
+                for point in (other_start, other_end)
+            ]
+            if max(distances) > tolerance:
+                continue
+            t1 = (other_start[0] - start[0]) * ux + (other_start[1] - start[1]) * uy
+            t2 = (other_end[0] - start[0]) * ux + (other_end[1] - start[1]) * uy
+            lo, hi = max(0.0, min(t1, t2)), min(length, max(t1, t2))
+            if hi - lo > epsilon:
+                result.append([
+                    start[0] + ux * lo, start[1] + uy * lo,
+                    start[0] + ux * hi, start[1] + uy * hi,
+                ])
+    return result
+
+
+def _wall_direction(a: list[float], b: list[float]) -> tuple[float, float]:
+    dx, dy = b[0] - a[0], b[1] - a[1]
+    length = math.hypot(dx, dy)
+    if length < 1e-12:
+        return 1.0, 0.0
+    dx, dy = dx / length, dy / length
+    if dx < -1e-12 or (abs(dx) <= 1e-12 and dy < 0):
+        dx, dy = -dx, -dy
+    return dx, dy
+
+
+def _js_round(value: float) -> int:
+    return math.floor(value + 0.5)
+
+
+def _quantize(value: float, pitch: float = GRID_STEP_N) -> float:
+    return _js_round(value / pitch) * pitch
+
+
+def _wall_key(a: list[float], b: list[float]) -> str:
+    midpoint_x = _quantize((float(a[0]) + float(b[0])) / 2)
+    midpoint_y = _quantize((float(a[1]) + float(b[1])) / 2)
+    dx, dy = _wall_direction(a, b)
+    angle = math.atan2(dy, dx)
+    if angle < 0:
+        angle += math.pi
+    angle = _js_round(angle * 1800) / 1800
+    return f"{midpoint_x:.6f},{midpoint_y:.6f}@{angle:.4f}"
+
+
+def deterministic_wall_segment_id(
+    space_id: str, a: list[float], b: list[float], owners: list[str], salt: str = "",
+) -> str:
+    ca, cb = _canonical_span(a, b)
+    seed = (f"{space_id}|{_point_key(ca)}|{_point_key(cb)}|"
+            f"{','.join(sorted(owners))}{salt}")
+    encoded = base64.b32encode(hashlib.sha256(seed.encode()).digest()).decode().lower()
+    return f"wall-{encoded[:20]}"
+
+
+def _translated_segment_delta(
+    a: list[float], b: list[float], previous: dict[str, Any],
+) -> tuple[float, float] | None:
+    def matches(pa: list[float], pb: list[float]) -> tuple[float, float] | None:
+        dx, dy = a[0] - pa[0], a[1] - pa[1]
+        if abs((b[0] - pb[0]) - dx) <= EPS and abs((b[1] - pb[1]) - dy) <= EPS:
+            return dx, dy
+        return None
+
+    return matches(previous["a"], previous["b"]) or matches(previous["b"], previous["a"])
+
+
+def _atomize(
+    space: dict[str, Any], old: dict[str, dict[str, Any]],
+) -> tuple[list[dict[str, Any]], list[dict[str, Any]]]:
+    rooms = space.get("rooms") or []
+    room_polys = {str(room.get("id", "")): _room_poly(room) for room in rooms}
+    global_breaks: list[list[float]] = []
+    explicit_spans = space.get("open_spans") or []
+    legacy_segments: list[list[float]] = []
+    for span in explicit_spans:
+        if isinstance(span, dict) and isinstance(span.get("a"), list) and isinstance(span.get("b"), list):
+            global_breaks.extend((span["a"], span["b"]))
+            legacy_segments.append([
+                float(span["a"][0]), float(span["a"][1]),
+                float(span["b"][0]), float(span["b"][1]),
+            ])
+    if not legacy_segments:
+        linked = lambda first, second: (
+            str(second.get("id", "")) in (first.get("open_to") or [])
+            or str(first.get("id", "")) in (second.get("open_to") or [])
+        )
+        for first_index, first in enumerate(rooms):
+            for second in rooms[first_index + 1:]:
+                if not linked(first, second):
+                    continue
+                for shared in _shared_boundaries(
+                    room_polys.get(str(first.get("id", "")), []),
+                    room_polys.get(str(second.get("id", "")), []),
+                ):
+                    legacy_segments.append(shared)
+                    global_breaks.extend(([shared[0], shared[1]], [shared[2], shared[3]]))
+    canonical_zero_segments: list[list[float]] = []
+    for room in rooms:
+        poly = room_polys.get(str(room.get("id", ""))) or []
+        wall_ids = room.get("wall_ids") or []
+        if len(wall_ids) != len(poly):
+            continue
+        for index, segment_id in enumerate(wall_ids):
+            previous = old.get(str(segment_id)) if isinstance(segment_id, str) else None
+            if previous is None or float(previous.get("cm", 0)) != 0:
+                continue
+            following = (index + 1) % len(poly)
+            canonical_zero_segments.append([
+                float(poly[index][0]), float(poly[index][1]),
+                float(poly[following][0]), float(poly[following][1]),
+            ])
+    for segment in canonical_zero_segments:
+        global_breaks.extend((segment[:2], segment[2:]))
+    zero_segments = canonical_zero_segments + legacy_segments
+
+    # #316 §3.1: a legacy open_spans/open_to cut never zeroes the atom that
+    # carries an existing contour opening; its edges become atom boundaries so
+    # the zero run continues on both sides of the opening.
+    legacy_era_openings: list[dict[str, Any]] = []
+    if legacy_segments:
+        for opening in space.get("openings") or []:
+            if not isinstance(opening, dict):
+                continue
+            host = opening.get("host")
+            if isinstance(host, dict) and host.get("kind") == "partition":
+                continue
+            try:
+                centre = [float(opening["x"]), float(opening["y"])]
+                angle = float(opening["angle"])
+                half = float(opening["length"]) / 2
+            except (KeyError, TypeError, ValueError):
+                continue
+            if half <= 0:
+                continue
+            # Only an opening that actually stands on a legacy cut changes the
+            # atomization; unrelated openings must not churn the catalogue.
+            if not any(
+                _distance_to_segment(centre, cut[:2], cut[2:]) <= GRID_STEP_N * 0.04
+                for cut in legacy_segments
+            ):
+                continue
+            legacy_era_openings.append(
+                {"centre": centre, "angle": angle, "half": half}
+            )
+            direction = (math.cos(math.radians(angle)), math.sin(math.radians(angle)))
+            global_breaks.extend((
+                [centre[0] - direction[0] * half, centre[1] - direction[1] * half],
+                [centre[0] + direction[0] * half, centre[1] + direction[1] * half],
+            ))
+
+    def _atom_carries_opening(a: list[float], b: list[float]) -> bool:
+        for entry in legacy_era_openings:
+            if not _angle_matches(a, b, entry["angle"]):
+                continue
+            if _distance_to_segment(entry["centre"], a, b) > GRID_STEP_N * 0.02:
+                continue
+            span = _length(a, b)
+            tc = _project_t(entry["centre"], a, b) * span
+            if tc + entry["half"] >= -EPS and tc - entry["half"] <= span + EPS:
+                return True
+        return False
+
+    for wall in space.get("walls") or []:
+        if isinstance(wall, dict) and isinstance(wall.get("a"), list) and isinstance(wall.get("b"), list):
+            global_breaks.extend((wall["a"], wall["b"]))
+
+    atoms_by_key: dict[str, dict[str, Any]] = {}
+    next_rooms: list[dict[str, Any]] = []
+    epsilon = GRID_STEP_N * 0.04
+    for raw_room in rooms:
+        room_id = str(raw_room.get("id", ""))
+        original = room_polys.get(room_id) or []
+        if not room_id or len(original) < 3:
+            raise WallSegmentMigrationError("invalid-room", room_id)
+        breaks = list(global_breaks)
+        for other_id, other_poly in room_polys.items():
+            if other_id == room_id:
+                continue
+            for shared in _shared_boundaries(original, other_poly):
+                breaks.extend(([shared[0], shared[1]], [shared[2], shared[3]]))
+
+        poly: list[list[float]] = []
+        parents: list[int] = []
+        for index, a in enumerate(original):
+            b = original[(index + 1) % len(original)]
+            poly.append(list(a))
+            parents.append(index)
+            length = _length(a, b)
+            if length < epsilon * 2:
+                raise WallSegmentMigrationError("zero-length", room_id)
+            gap = min(0.499, epsilon * 2 / length)
+            positions: list[float] = []
+            for breakpoint in breaks:
+                if _distance_to_segment(breakpoint, a, b) > epsilon:
+                    continue
+                t = _project_t(breakpoint, a, b)
+                if t <= gap or t >= 1 - gap:
+                    continue
+                if any(abs(existing - t) * length <= epsilon * 2 for existing in positions):
+                    continue
+                positions.append(t)
+            for t in sorted(positions):
+                poly.append([a[0] + (b[0] - a[0]) * t, a[1] + (b[1] - a[1]) * t])
+                parents.append(index)
+
+        old_ids = raw_room.get("wall_ids") if isinstance(raw_room.get("wall_ids"), list) else []
+        indexed_lineage = len(old_ids) == len(original)
+        rigid_delta: tuple[float, float] | None = None
+        rigid_indexed_lineage = indexed_lineage
+        if rigid_indexed_lineage:
+            for index, a in enumerate(original):
+                previous = old.get(old_ids[index])
+                delta = _translated_segment_delta(
+                    a, original[(index + 1) % len(original)], previous,
+                ) if previous else None
+                if delta is None or (rigid_delta is not None and (
+                    abs(delta[0] - rigid_delta[0]) > EPS
+                    or abs(delta[1] - rigid_delta[1]) > EPS
+                )):
+                    rigid_indexed_lineage = False
+                    break
+                rigid_delta = delta
+        wall_keys: list[str] = []
+        for index, a in enumerate(poly):
+            b = poly[(index + 1) % len(poly)]
+            key = _span_key(a, b)
+            atom = atoms_by_key.setdefault(key, {
+                "key": key, "a": _canonical_span(a, b)[0], "b": _canonical_span(a, b)[1],
+                "owners": set(), "preferred": set(), "positional": set(),
+                "preferred_carriers": {},
+                "parent_keys": set(), "zero_wall": False,
+            })
+            atom["owners"].add(room_id)
+            if len(atom["owners"]) > 2:
+                raise WallSegmentMigrationError("third-owner", key)
+            parent_index = parents[index]
+            atom["parent_keys"].add(_wall_key(original[parent_index], original[(parent_index + 1) % len(original)]))
+            midpoint = [(a[0] + b[0]) / 2, (a[1] + b[1]) / 2]
+            covered_by = lambda cuts: any(
+                _distance_to_segment(midpoint, cut[:2], cut[2:]) <= GRID_STEP_N * 0.04
+                for cut in cuts
+            )
+            # Canonical cm:0 atoms stay zero; a LEGACY cut spares the atom
+            # that carries an opening (#316 §3.1).
+            atom["zero_wall"] = atom["zero_wall"] or covered_by(canonical_zero_segments) or (
+                covered_by(legacy_segments) and not _atom_carries_opening(a, b)
+            )
+            if indexed_lineage and isinstance(old_ids[parent_index], str) and old_ids[parent_index]:
+                previous = old.get(old_ids[parent_index])
+                if rigid_indexed_lineage or previous is None or _collinear_overlap(
+                    a, b, previous["a"], previous["b"]
+                ) > EPS:
+                    atom["preferred"].add(old_ids[parent_index])
+                else:
+                    atom["positional"].add(old_ids[parent_index])
+                atom["preferred_carriers"][old_ids[parent_index]] = {
+                    "a": list(original[parent_index]),
+                    "b": list(original[(parent_index + 1) % len(original)]),
+                }
+            wall_keys.append(key)
+        next_room = {key: copy.deepcopy(value) for key, value in raw_room.items() if key != "wall_ids"}
+        next_room["poly"] = poly
+        next_room["wall_ids"] = wall_keys
+        next_rooms.append(next_room)
+    return sorted(atoms_by_key.values(), key=lambda atom: atom["key"]), next_rooms
+
+
+def _thickness(space: dict[str, Any], atom: dict[str, Any], previous: dict[str, Any] | None) -> float:
+    if atom.get("zero_wall"):
+        return 0.0
+    candidates: list[float] = []
+    query_key = _wall_key(atom["a"], atom["b"])
+    query_length = _length(atom["a"], atom["b"])
+    for wall in space.get("walls") or []:
+        try:
+            cm = float(wall.get("cm", 0))
+        except (TypeError, ValueError):
+            continue
+        if cm <= 0:
+            continue
+        exact_key = wall.get("key") == query_key or wall.get("key") in atom["parent_keys"]
+        covers = False
+        if isinstance(wall.get("a"), list) and isinstance(wall.get("b"), list):
+            overlap = _collinear_overlap(atom["a"], atom["b"], wall["a"], wall["b"])
+            covers = overlap >= query_length - EPS
+        if exact_key or covers:
+            candidates.append(max(1.0, min(100.0, cm)))
+    unique = {round(value, 9) for value in candidates}
+    if len(unique) > 1:
+        raise WallSegmentMigrationError("thickness-conflict", atom["key"])
+    if candidates:
+        return candidates[0]
+    if previous is not None and float(previous.get("cm", 0)) > 0:
+        return float(previous["cm"])
+    return 0.0
+
+
+def _non_catalog_ids(space: dict[str, Any]) -> set[str]:
+    result: set[str] = set()
+    for name in ("rooms", "openings", "decor", "room_drafts", "partitions", "wall_columns"):
+        for item in space.get(name) or []:
+            if isinstance(item, dict) and isinstance(item.get("id"), str) and item["id"]:
+                result.add(item["id"])
+    for draft in space.get("room_drafts") or []:
+        for segment in draft.get("segments") or []:
+            if isinstance(segment, dict) and isinstance(segment.get("id"), str) and segment["id"]:
+                result.add(segment["id"])
+    return result
+
+
+def _fresh_wall_segment_id(used: set[str]) -> str:
+    for _attempt in range(1000):
+        segment_id = f"wall-{uuid.uuid4()}"
+        if segment_id not in used:
+            return segment_id
+    raise WallSegmentMigrationError("duplicate-id", "id factory exhausted")
+
+
+def _assign_lineage(
+    space: dict[str, Any], atoms: list[dict[str, Any]], old: dict[str, dict],
+    initial_migration: bool,
+) -> None:
+    old_by_key = {_span_key(segment["a"], segment["b"]): segment for segment in old.values()}
+    host_counts: dict[str, int] = {}
+    for opening in space.get("openings") or []:
+        host = opening.get("host") if isinstance(opening, dict) else None
+        if isinstance(host, dict) and host.get("kind") == "wall":
+            host_counts[str(host.get("id"))] = host_counts.get(str(host.get("id")), 0) + 1
+    proposals: dict[str, dict[str, Any]] = {}
+    for atom in atoms:
+        if len(atom["preferred"]) > 1:
+            raise WallSegmentMigrationError("duplicate-id", ",".join(sorted(atom["preferred"])))
+        preferred_id = next(iter(atom["preferred"]), None)
+        preferred = old.get(preferred_id) if preferred_id else None
+        if preferred:
+            proposals[atom["key"]] = preferred
+            continue
+        carrier = atom["preferred_carriers"].get(preferred_id) if preferred_id else None
+        if preferred_id and carrier:
+            proposals[atom["key"]] = {
+                "id": preferred_id, "a": carrier["a"], "b": carrier["b"], "cm": 0,
+            }
+            continue
+        if atom["key"] in old_by_key:
+            proposals[atom["key"]] = old_by_key[atom["key"]]
+            continue
+        overlaps = [segment for segment in old.values()
+                    if _collinear_overlap(atom["a"], atom["b"], segment["a"], segment["b"]) > EPS]
+        overlaps.sort(key=lambda segment: (
+            -host_counts.get(str(segment["id"]), 0),
+            -_length(segment["a"], segment["b"]), str(segment["id"]),
+        ))
+        if overlaps:
+            proposals[atom["key"]] = overlaps[0]
+        elif len(atom["positional"]) == 1:
+            positional = old.get(next(iter(atom["positional"])))
+            if positional:
+                proposals[atom["key"]] = positional
+
+    by_id: dict[str, list[dict[str, Any]]] = {}
+    for atom in atoms:
+        proposal = proposals.get(atom["key"])
+        if proposal:
+            by_id.setdefault(str(proposal["id"]), []).append(atom)
+    for segment_id, candidates in by_id.items():
+        old_segment = old.get(segment_id) or proposals.get(candidates[0]["key"])
+        if old_segment is None:
+            raise WallSegmentMigrationError("duplicate-id", segment_id)
+        midpoint = [
+            (old_segment["a"][0] + old_segment["b"][0]) / 2,
+            (old_segment["a"][1] + old_segment["b"][1]) / 2,
+        ]
+        candidates.sort(key=lambda atom: (
+            0 if _distance_to_segment(midpoint, atom["a"], atom["b"]) <= EPS else 1,
+            0 if _distance_to_segment(old_segment["a"], atom["a"], atom["b"]) <= EPS else 1,
+            atom["key"],
+        ))
+        candidates[0]["id"] = segment_id
+
+    used = _non_catalog_ids(space)
+    for atom in atoms:
+        if not atom.get("id"):
+            continue
+        if atom["id"] in used:
+            raise WallSegmentMigrationError("duplicate-id", atom["id"])
+        used.add(atom["id"])
+    unassigned = [atom for atom in atoms if not atom.get("id")]
+    if initial_migration:
+        seeds: list[tuple[str, str, str, dict[str, Any]]] = []
+        for atom in unassigned:
+            ca, cb = _canonical_span(atom["a"], atom["b"])
+            seed = (f"{space.get('id', '')}|{_point_key(ca)}|{_point_key(cb)}|"
+                    f"{','.join(sorted(atom['owners']))}")
+            digest = base64.b32encode(hashlib.sha256(seed.encode()).digest()).decode().lower()
+            seeds.append((digest, atom["key"], seed, atom))
+        full_digests: dict[str, str] = {}
+        for digest, _key, seed, atom in sorted(seeds):
+            if digest in full_digests and full_digests[digest] != seed:
+                raise WallSegmentMigrationError("duplicate-id", digest)
+            full_digests[digest] = seed
+            base = f"wall-{digest[:20]}"
+            suffix, segment_id = 1, base
+            while segment_id in used:
+                suffix += 1
+                segment_id = f"{base}-{suffix}"
+            atom["id"] = segment_id
+            used.add(segment_id)
+    else:
+        for atom in unassigned:
+            atom["id"] = _fresh_wall_segment_id(used)
+            used.add(atom["id"])
+
+
+def _angle_matches(a: list[float], b: list[float], angle: float) -> bool:
+    dx, dy = _wall_direction(a, b)
+    wall_angle = math.degrees(math.atan2(dy, dx))
+    difference = abs((wall_angle - angle + 90) % 180 - 90)
+    return difference <= 8
+
+
+def _host_openings(
+    space: dict[str, Any], segments: list[dict[str, Any]], initial_migration: bool,
+) -> None:
+    for opening in space.get("openings") or []:
+        host = opening.get("host")
+        if isinstance(host, dict) and host.get("kind") == "partition":
+            continue
+        try:
+            centre = [float(opening["x"]), float(opening["y"])]
+            angle, half = float(opening["angle"]), float(opening["length"]) / 2
+        except (KeyError, TypeError, ValueError):
+            if initial_migration:
+                # #316 §3.4: the initial migration never throws over an opening.
+                opening.pop("host", None)
+                continue
+            raise WallSegmentMigrationError("opening-host", str(opening.get("id", ""))) from None
+
+        def eligible(segment: dict[str, Any]) -> bool:
+            if float(segment.get("cm", 0)) <= 0:
+                return False
+            t = _project_t(centre, segment["a"], segment["b"])
+            span = _length(segment["a"], segment["b"])
+            return (-EPS <= t <= 1 + EPS
+                    and _distance_to_segment(centre, segment["a"], segment["b"])
+                    <= GRID_STEP_N * 0.02
+                    and _angle_matches(segment["a"], segment["b"], angle)
+                    and half >= 0 and t * span - half >= -EPS
+                    and t * span + half <= span + EPS)
+
+        def materialize(carrier: dict[str, Any]) -> None:
+            opening["host"] = {
+                "kind": "wall", "id": carrier["id"],
+                "t": max(0.0, min(1.0, _project_t(centre, carrier["a"], carrier["b"]))),
+            }
+
+        current = None
+        if isinstance(host, dict) and host.get("kind") == "wall":
+            current = next((segment for segment in segments if segment["id"] == host.get("id")), None)
+        candidates = [current] if current is not None and eligible(current) else [
+            segment for segment in segments if eligible(segment)
+        ]
+        if len(candidates) == 1:
+            materialize(candidates[0])
+            continue
+        # #316 §3.3: an unhosted opening is a valid degraded v9 state. A later
+        # write keeps it, may self-heal it, and never fails over it.
+        if host is None and not initial_migration:
+            continue
+        if not initial_migration:
+            raise WallSegmentMigrationError("opening-host", str(opening.get("id", "")))
+
+        def pick(pool: list[dict[str, Any]]) -> dict[str, Any] | None:
+            if not pool:
+                return None
+            if current is not None and any(item is current for item in pool):
+                return current
+            return sorted(pool, key=lambda segment: (
+                _distance_to_segment(centre, segment["a"], segment["b"]),
+                -float(segment.get("cm", 0)),
+                str(segment.get("id", "")),
+            ))[0]
+
+        # #316 §3.2 tie-break. No distant fallback pool (CODE-REVIEW-316-r1
+        # H1): a host away from the opening's own x/y would violate the
+        # geometry-match invariant of CONFIG_SCHEMA and wedge the write on the
+        # schema layer; without an in-place carrier the opening goes straight
+        # to the unhosted degraded state.
+        carrier = pick([segment for segment in segments if eligible(segment)])
+        if carrier is not None:
+            materialize(carrier)
+        else:
+            opening.pop("host", None)
+
+
+def _migrate_space(space: dict[str, Any], initial_migration: bool) -> int:
+    old: dict[str, dict[str, Any]] = {}
+    for segment in space.get("wall_segments") or []:
+        segment_id = str(segment.get("id", ""))
+        if not segment_id or segment_id in old:
+            raise WallSegmentMigrationError("duplicate-id", segment_id)
+        old[segment_id] = segment
+    atoms, rooms = _atomize(space, old)
+    _assign_lineage(space, atoms, old, initial_migration)
+    segments = []
+    for atom in atoms:
+        previous = old.get(atom["id"])
+        segment = copy.deepcopy(previous) if previous else {}
+        segment.update({
+            "id": atom["id"], "a": list(atom["a"]), "b": list(atom["b"]),
+            "cm": _thickness(space, atom, previous),
+        })
+        segments.append(segment)
+    id_by_key = {atom["key"]: atom["id"] for atom in atoms}
+    for room in rooms:
+        room["wall_ids"] = [id_by_key[key] for key in room["wall_ids"]]
+    space["rooms"] = rooms
+    space["wall_segments"] = segments
+    walls = [{
+        "key": _wall_key(segment["a"], segment["b"]),
+        "cm": segment["cm"], "a": list(segment["a"]), "b": list(segment["b"]),
+    } for segment in segments if float(segment["cm"]) > 0]
+    if walls:
+        space["walls"] = walls
+    else:
+        space.pop("walls", None)
+    space.pop("open_spans", None)
+    for room in space.get("rooms") or []:
+        room.pop("open_to", None)
+    draft_used = {
+        str(item["id"])
+        for name in ("rooms", "openings", "decor", "room_drafts", "partitions",
+                     "wall_columns", "wall_segments")
+        for item in space.get(name) or []
+        if isinstance(item, dict) and isinstance(item.get("id"), str) and item["id"]
+    }
+    for draft in space.get("room_drafts") or []:
+        for index, segment in enumerate(draft.get("segments") or []):
+            if isinstance(segment.get("id"), str) and segment["id"]:
+                if segment["id"] in draft_used:
+                    raise WallSegmentMigrationError("duplicate-id", segment["id"])
+                draft_used.add(segment["id"])
+                continue
+            try:
+                a, b = draft["points"][index], draft["points"][index + 1]
+            except (KeyError, IndexError, TypeError):
+                raise WallSegmentMigrationError("zero-length", str(draft.get("id", ""))) from None
+            if initial_migration:
+                base = deterministic_wall_segment_id(
+                    str(space.get("id", "")), a, b, [f"draft:{draft.get('id', '')}"],
+                )
+                suffix, segment["id"] = 1, base
+                while segment["id"] in draft_used:
+                    suffix += 1
+                    segment["id"] = f"{base}-{suffix}"
+            else:
+                segment["id"] = _fresh_wall_segment_id(draft_used)
+            draft_used.add(segment["id"])
+    _host_openings(space, segments, initial_migration)
+    return sum(1 for segment in segments if segment["id"] not in old)
+
+
+def commit_wall_segment_model(config: Any) -> tuple[Any, int]:
+    """Return one migrated deep copy and the count of newly assigned wall ids."""
+    candidate = canonicalize_config_geometry(copy.deepcopy(config))
+    if not isinstance(candidate, dict):
+        raise WallSegmentMigrationError("invalid-room")
+    migrated = 0
+    initial_migration = int(candidate.get("model_version", 0) or 0) < WALL_SEGMENT_MODEL_VERSION
+    for space in candidate.get("spaces") or []:
+        migrated += _migrate_space(space, initial_migration)
+    candidate["model_version"] = WALL_SEGMENT_MODEL_VERSION
+    return canonicalize_config_geometry(candidate), migrated
@@ -24,6 +24,7 @@ from .const import (
    CONTENT_URL, FILES_DIR, MAX_PLANS_BYTES, MAX_PLANS_FILES, MAX_PLANS_LISTED,
    MAX_SIGN_PATHS,
    PLANS_DIR, PLANS_URL,
+    VERSION,
 )
 from .coordinate_canonicalization import (
    canonicalize_config_geometry,
@@ -60,13 +61,19 @@ from .virtual_lights import (
 )
 from .registry_snapshot import import_registry_snapshot
 from .projection import project_config, project_layout
+from .wall_segment_model import (
+    WALL_SEGMENT_MODEL_VERSION,
+    WallSegmentMigrationError,
+    commit_wall_segment_model,
+)
 from .validation import (
    CONFIG_SCHEMA, LAYOUT_SCHEMA, MAX_CONFIG_BYTES, MAX_PLAN_BYTES,
    PLAN_EXTENSIONS, POS_SCHEMA, MarkerControlError, OpeningPassageError,
-    PartitionOpeningHostError, PartitionOpeningJambMarginError, sanitize_filename,
+    PartitionOpeningHostError, PartitionOpeningJambMarginError,
+    WallModelClientOutdatedError, sanitize_filename,
    validate_opening_passages, validate_partition_opening_hosts,
    validate_marker_controls, validate_marker_light_entities,
-    validate_marker_value_badges, valid_space_id,
+    validate_marker_value_badges, validate_wall_model_transition, valid_space_id,
 )


@@ -1151,6 +1158,9 @@ async def ws_config_get(hass: HomeAssistant, connection, msg: dict[str, Any]) ->
            "can_write": may_write(hass, getattr(connection, "user", None)),
            "can_optimize_undo": _optimizer_backup_is_current(data, layout_data),
            "undo_kind": _undo_kind(data, layout_data),
+            # #295: the card compares this against its own version to decide
+            # whether the «update House Plan» preflight hint can actually help.
+            "integration_version": VERSION,
        },
    )

@@ -1259,7 +1269,9 @@ def _missing_internal_attachments(
@websocket_api.websocket_command(
    {
        vol.Required("type"): "houseplan/config/set",
-        vol.Required("config"): CONFIG_SCHEMA,
+        # Semantic stale-client detection needs the stored v8 document and
+        # therefore runs inside the write lock before CONFIG_SCHEMA.
+        vol.Required("config"): dict,
        vol.Optional("expected_rev"): int,
    }
 )
@@ -1309,6 +1321,10 @@ async def ws_config_set(hass: HomeAssistant, connection, msg: dict[str, Any]) ->
        # the lossless controls array. Validate only edges introduced by this
        # write so an unrelated edit can still round-trip a legacy broken ref.
        try:
+            validate_wall_model_transition(msg["config"], data.get("config"))
+            validated_config = CONFIG_SCHEMA(msg["config"])
+            msg["config"].clear()
+            msg["config"].update(validated_config)
            validate_marker_controls(msg["config"], data.get("config"))
            validate_marker_light_entities(msg["config"], data.get("config"))
            validate_marker_value_badges(msg["config"], data.get("config"))
@@ -1316,10 +1332,13 @@ async def ws_config_set(hass: HomeAssistant, connection, msg: dict[str, Any]) ->
            validate_partition_opening_hosts(msg["config"], data.get("config"))
        except (
            MarkerControlError, OpeningPassageError, PartitionOpeningHostError,
-            PartitionOpeningJambMarginError,
+            PartitionOpeningJambMarginError, WallModelClientOutdatedError,
        ) as err:
            connection.send_error(msg["id"], err.code, str(err))
            return
+        except vol.Invalid as err:
+            connection.send_error(msg["id"], "invalid_format", str(err))
+            return
        # An internal plan url must name a file that exists. The card can pick a
        # plan and then delete it from the same dialog, and two clients can do
        # the same thing in either order — the lock serialises them but says
@@ -1577,7 +1596,7 @@ async def ws_space_delete(hass: HomeAssistant, connection, msg: dict[str, Any])
@websocket_api.websocket_command(
    {
        vol.Required("type"): "houseplan/plan/optimize",
-        vol.Required("config"): CONFIG_SCHEMA,
+        vol.Required("config"): dict,
        vol.Required("layout"): LAYOUT_SCHEMA,
        vol.Required("expected_config_rev"): int,
        vol.Required("expected_layout_rev"): int,
@@ -1622,6 +1641,35 @@ async def ws_plan_optimize(hass: HomeAssistant, connection, msg: dict[str, Any])
        # layout transaction. It must enforce the same marker-link semantics
        # as config/set; otherwise a crafted client can persist a new cycle.
        try:
+            validate_wall_model_transition(msg["config"], config_data.get("config"))
+            try:
+                submitted_model = int(msg["config"].get("model_version", 0) or 0)
+            except (TypeError, ValueError):
+                submitted_model = WALL_SEGMENT_MODEL_VERSION
+            # Optimize is an explicit structural writer and therefore the
+            # server-side v7 -> v8 barrier as well. Current v8 candidates are
+            # validated verbatim: the backend must never invent lineage for a
+            # graph already authored by a current client.
+            candidate_config = CONFIG_SCHEMA(msg["config"])
+            # Keep the established public validation contract ahead of the
+            # structural migration barrier. A malformed passage can also make
+            # wall-host materialisation impossible, but callers must still get
+            # the actionable `invalid_passage_fields` code rather than the
+            # generic wall-model blocker.
+            validate_opening_passages(candidate_config, config_data.get("config"))
+            if submitted_model < WALL_SEGMENT_MODEL_VERSION:
+                candidate_config, _ = commit_wall_segment_model(candidate_config)
+            validated_config = CONFIG_SCHEMA(candidate_config)
+            migrated_size = len(json.dumps(validated_config, separators=(",", ":")))
+            if migrated_size > MAX_CONFIG_BYTES:
+                connection.send_error(
+                    msg["id"], "too_large",
+                    f"Configuration is {migrated_size // 1024} KB, "
+                    f"the limit is {MAX_CONFIG_BYTES // 1024} KB",
+                )
+                return
+            msg["config"].clear()
+            msg["config"].update(validated_config)
            validate_marker_controls(msg["config"], config_data.get("config"))
            validate_marker_light_entities(msg["config"], config_data.get("config"))
            validate_marker_value_badges(msg["config"], config_data.get("config"))
@@ -1632,10 +1680,14 @@ async def ws_plan_optimize(hass: HomeAssistant, connection, msg: dict[str, Any])
            )
        except (
            MarkerControlError, OpeningPassageError, PartitionOpeningHostError,
-            PartitionOpeningJambMarginError,
+            PartitionOpeningJambMarginError, WallModelClientOutdatedError,
+            WallSegmentMigrationError,
        ) as err:
            connection.send_error(msg["id"], err.code, str(err))
            return
+        except vol.Invalid as err:
+            connection.send_error(msg["id"], "invalid_format", str(err))
+            return

        missing = await hass.async_add_executor_job(
            _missing_internal_plans,
@@ -87,7 +87,7 @@ const viewport = { width: 1280, height: 900 };
 const { page, browser } = await launch(
  viewport, 1,
  ['--enable-precise-memory-info', '--js-flags=--expose-gc'],
-  {}, resolve(targetRoot, 'demo/srv'),
+  {}, resolve(targetRoot, 'demo/srv'), targetRoot,
 );
 await page.addScriptTag({
  content: `window.__hpAssertCardContract = ${assertCardContract.toString()};`,
@@ -43,6 +43,7 @@ const { page, browser } = await launch(
  ['--enable-precise-memory-info', '--js-flags=--expose-gc'],
  {},
  resolve(targetRoot, 'demo/srv'),
+  targetRoot,
 );
 await page.emulateMedia({ reducedMotion: 'reduce' });
 await page.addStyleTag({
@@ -345,7 +346,7 @@ try {
          target: null,
        };
        card._rszEdgeDown(quietEvent, room.id, 1);
-        const plan = card._rszDrag?.plan;
+        const plan = card._resize?.plan;
        if (!plan) throw new Error('large-house resize plan was not created');
        const target = [
          plan.a[0] + plan.n[0] * card._gridPitch,
@@ -0,0 +1,86 @@
+/**
+ * #314 anonymised dense-plan fixture.
+ *
+ * It preserves the structural shape of the owner's report without names,
+ * markers, layout, or original coordinates: 13 rooms, 44 catalogue walls,
+ * 24 intentional partitions, and one pre-existing two-point draft.  The last
+ * object is known debt and must remain the only invariant finding before and
+ * after drawing another room.
+ */
+import { WALL_KEY_PITCH } from './wall-key.mjs';
+
+export function makeV8DraftRegressionFixture() {
+  const step = WALL_KEY_PITCH;
+  const point = (x, y) => [x * step, y * step];
+  const segmentIds = new Map();
+  const wallSegments = [];
+  const keyOf = (a, b) => {
+    const left = `${a[0]},${a[1]}`;
+    const right = `${b[0]},${b[1]}`;
+    return left < right ? `${left}|${right}` : `${right}|${left}`;
+  };
+  const wallId = (a, b) => {
+    const key = keyOf(a, b);
+    let id = segmentIds.get(key);
+    if (!id) {
+      id = `wall-314-${String(wallSegments.length + 1).padStart(3, '0')}`;
+      segmentIds.set(key, id);
+      wallSegments.push({ id, a: [...a], b: [...b], cm: 15 });
+    }
+    return id;
+  };
+
+  const rooms = Array.from({ length: 13 }, (_, index) => {
+    const x0 = 4 + index * 12;
+    const x1 = x0 + 12;
+    const y0 = 4;
+    const y1 = 16;
+    const poly = [point(x0, y0), point(x1, y0), point(x1, y1)];
+    // Four split top edges make the catalogue population exactly 44 while
+    // keeping all rooms valid and non-overlapping.
+    if (index < 4) poly.push(point(x0 + 6, y1));
+    poly.push(point(x0, y1));
+    return {
+      id: `room-314-${String(index + 1).padStart(2, '0')}`,
+      name: `Room ${index + 1}`,
+      poly,
+      wall_ids: poly.map((a, edge) => wallId(a, poly[(edge + 1) % poly.length])),
+    };
+  });
+
+  const partitions = Array.from({ length: 24 }, (_, index) => {
+    const row = Math.floor(index / 8);
+    const x = 4 + (index % 8) * 18;
+    const y = 28 + row * 8;
+    return {
+      id: `partition-314-${String(index + 1).padStart(2, '0')}`,
+      a: point(x, y),
+      b: point(x + 8, y + 2),
+      cm: 15 + (index % 3) * 5,
+    };
+  });
+
+  if (wallSegments.length !== 44) {
+    throw new Error(`fixture catalogue drifted: expected 44, got ${wallSegments.length}`);
+  }
+
+  return {
+    model_version: 8,
+    spaces: [{
+      id: 'space-314-dense',
+      title: 'Dense regression fixture',
+      cell_cm: 5,
+      view_box: [0, 0, 400, 400],
+      rooms,
+      wall_segments: wallSegments,
+      partitions,
+      room_drafts: [{
+        id: 'draft-314-known-debt',
+        points: [point(4, 56), point(14, 64)],
+        segments: [{ id: 'wall-314-known-draft', cm: 15 }],
+      }],
+    }],
+    markers: [],
+    settings: {},
+  };
+}
@@ -1,138 +1,139 @@
 {
  "schema": 1,
-  "matrixVersion": 46,
-  "acceptedAt": "2026-08-25T20:12:50.448Z",
-  "sourceFingerprint": "e28606975682347f90f12971053825ce474085cbddd56082e867370b1039d14d",
+  "matrixVersion": 47,
+  "acceptedAt": "2026-08-26T20:41:35.180774Z",
+  "sourceFingerprint": "80bd29ef9692067b706f221eaf8d62b4030e3a51b91bc9cff8d854aaee373700",
  "chromium": "151.0.7922.34",
  "scenarios": {
-    "hidden-wall-diagnostics-plan-light": "6470ed8b09b21144ec1399389e9a57774e977a6473b8eaa7de7e9b5df3273f21",
-    "hidden-wall-diagnostics-plan-dark": "da6e725ddfad7c807408a710b78090dc222b56dcee484a29baa68b5452fc44e5",
+    "hidden-wall-diagnostics-plan-light": "37ba151aa6b1ea7b1b270d461ccca348444c5eeb14a5592bf045a0e69b0fb83e",
+    "hidden-wall-diagnostics-plan-dark": "565d5481f744704a2a6f18658b9b6fa65e7cdbfcd11b50a2bedbc0daae2d8488",
    "coincident-partition-before-dark": "19626db704fccb7a42b519ffb20b7bad82c726e8845c752ab451f731d264561c",
    "coincident-partition-thin-dark": "3afede1f99b86454bf4e50d9628196a2240243e034644592c5c3efa1b4561930",
    "coincident-partition-thick-dark": "57960bd09e6cbbeb073561692690ca68a72d6dbf8242198ef73b8d4ae4d8fbcc",
    "coincident-partition-virtual-dark": "da7adbf931ad95f4e620d9d088177f1da20d88a21b9e85b6ff2675925d5557b4",
    "split-corner-wall-before-dark": "3176dc67f54d5309f87c94e1077b4f69eb1db9f660469fbf97953038323430f3",
-    "split-corner-wall-thin-dark": "17e49394c300887bb5349bf477292571e96e209c9515db6853348883d95a1422",
-    "split-corner-wall-thick-dark": "f7864a6b2ab58586540f836183c9e59f09f9f57165ec0e0b9cd8444ada71153c",
+    "split-corner-wall-thin-dark": "48062a49e12728c377a7c4352148381b1be2a5606b6792d754ae055b04c22be1",
+    "split-corner-wall-thick-dark": "a5d795eec4561e3a1aa9c37843fadddcb04d888d5a49e6ffacf29c17b7798568",
    "split-zero-divider-taper-dark": "3de38befb41f15ef4047da1390e061b1b5756340142dd9204d011287ff39be5b",
-    "isometric-geometry-view-dark": "43ad006844a78b502b36aeeb82d82669532e06d2c798de928a5207acd24bd5f9",
-    "isometric-geometry-view-light": "0fcb10ffdc0baa9006d1c2f0406ebf19e71ba9feda180979a51b74166d7200d2",
-    "isometric-live-layers-dark": "8aaa914fc45780f67dd5c008a106696d21235a9acee7402f9cc8ae51a26660f3",
-    "isometric-no-borders-dark": "c105382d883bbdae8562b756ccbf47ac1fcf46675c6aa7654289856223a3ebf0",
-    "isometric-touch-kiosk-dark": "be122ceec8114374ba384f51d5d9287e498a97354865c5a9f91d505ca18d8640",
-    "isometric-large-warm-remount-dark": "d76e3334bf80bff265b1e8aa6770c5eff5df6fbfebeb4703b04d048c4252eb68",
-    "geometry-view-dark-fit": "1b80d2d0fe84cfe15f1fa29ccc2a2dcc66b4c5e62d1722c06c00442c78979be0",
-    "geometry-view-light-fit": "91caf6621af00eb0cd16589e2fc79976cdca1e8467d0e86151ecbc46948612d9",
-    "room-label-parity-view-dark": "7f1da43466a13f82a7595dddabe6938ed974debfb14c8f40e729e273a53ac4ff",
-    "room-label-parity-plan-dark": "5f976d5743d68a27b594e1a5ddf45e5ad3708f5c703409e5cefb7c96d3048096",
-    "room-label-parity-view-light": "ee3d303fb2b329c356a4354d355c29694130a38d4812ffbfefbe861f5d3f9860",
-    "room-label-parity-plan-light": "d32b538499a031d4310b243cc9ef43610f6cd67aabfde7cd01b59c88b0363ec5",
+    "isometric-geometry-view-dark": "0d8427299c77e1e3bb86f37f53128a6640b6666e0b682e5f96085c4f07a657ec",
+    "isometric-geometry-view-light": "a3e592448ad3ad4ff65266f1fd6f31259c01a9baf47392f6b8be9811d74f8dce",
+    "isometric-live-layers-dark": "90fa1c0b64a12626e481c5f34e515c53b3e06cd657f5976bb8a72127aec3e1e9",
+    "isometric-no-borders-dark": "a0abf9fdc31092980de3bcbf8598844b6e3d152363694e9bd070d45af73c26d9",
+    "isometric-touch-kiosk-dark": "d3ae363165c4f0aba65bcbac9bd6bdca79f29aca03bba997f3abec1860eb1e55",
+    "isometric-large-warm-remount-dark": "de7733e6aeef7cf7b05cca9c8f6bb4aa627fd16ab2d4198659e24ff9fa3b5bda",
+    "geometry-view-dark-fit": "2d96e776ea9fc8a136896b58df30abb13a8a53e6c40e5b4f4e12c6dba522380f",
+    "geometry-view-light-fit": "60e8a908fc1c3be3ca5c9b82bf432120d808d913f743c04683b4a2c501d84659",
+    "room-label-parity-view-dark": "5ff9dff2da5c747cfab83ade2a929afadcf2eb9340182862da38ab36a35cd3c1",
+    "room-label-parity-plan-dark": "6528f1edf07e51e470b1c05dcf5292888a14ef6e44d04f7119cfb11b06155c2b",
+    "room-label-parity-view-light": "789f8f3b6211d35e70021094f2063dc9c6ac57599d9d64743a33b7ae9dd868c2",
+    "room-label-parity-plan-light": "272dc35d85b1f07efc4c2a05c31f6adbf7d10c648e3c678e7235e35167f83a7d",
    "washer-active-cycle-dark": "d74a646bc71b8d6d0d5b09e6862b4846b0e369da2520afa76d5b3d601c832a15",
    "washer-idle-cycle-dark": "f7fae5c2f6856a3df5bd3f3028fcf829ef0039c7b43c91c27ac86d25626e8d66",
-    "day-cycle-dawn-dark": "3f32bc1ed042475516f7e239aedd7fee11717b00fa2103ae9f1231e006d64015",
-    "day-cycle-day-dark": "1a0f53c948ae669c7ab4e1dcb931c11e7c878974862637dd1f596011876a7ed4",
-    "day-cycle-dusk-dark": "ec95e99ac3c7e4d6affa2f7944759727251dc4f1b62e2855e421a7e48f7280eb",
-    "day-cycle-night-dark": "cc49dc53dabb63b7dd800eaa65c8748972fcf3c1abd948b34d1e0f973e63f0d2",
-    "geometry-plan-editor-dark": "fd8d067daa3b2a4e572dea9644486e6324318e8ea4e5f43e3df2069a05389a88",
-    "safe-resize-handles-clamp-light": "ed705040357cad043095baf12d02cc69abdc3db27ff40066a6979be85d035f77",
-    "safe-resize-handles-clamp-dark": "9d81a45f3acac787cde1b9eb74a858020fbad09670b8ff5b081869b5eca73b82",
-    "space-tab-drop-before-light": "401dded3d7fdff3e823d46eac1b3cef2d6e0eb05f48b5ea289cdd8ecd941dee0",
-    "space-tab-drop-after-dark": "a851621040e14f911b1080488f2c75e3d9bc0d5fef74fb5d0081f80b023ff0a2",
-    "plan-snap-endpoint-light": "db967076cd9fd50c2a2a1337e4ecbf4ef67cb7f800401f6227497c75415951d5",
-    "plan-snap-line-gaps-dark": "ff1b6bbf2e1b4272bb2f0e96d92136aa6960ee24acef1b63b4478e54441a4b58",
-    "wall-junctions-plan-preview-light": "fa81fa6c6dba92578a4beee5ed29f407443a3bc61affa25c44fcfefab0c7070c",
-    "wall-junctions-plan-t-dark": "f8a517d316a99ca9ee5b4ff56f515be15d440adfc551bbdaaa5e9d9a411a79bc",
+    "day-cycle-dawn-dark": "be3b891520637857b7f89dc88284753a15601ebae4db7db750714b9535348d33",
+    "day-cycle-day-dark": "1b791b8a773a5910a71338351ab12fdc36c22742a358b647ff4f295431fa4cfd",
+    "day-cycle-dusk-dark": "14182ad89301cb260ba21ee5077134ed408f038ea878ed4539b84f987182f910",
+    "day-cycle-night-dark": "407632fc54e13e6362b7e583d6e2b7bdd31b4093823846e4e630de0c8f542120",
+    "geometry-plan-editor-dark": "40a0083511c1ff9d0b8f1ec419af63e2a28f1f9a0ec3768387a10c89efe73905",
+    "safe-resize-handles-clamp-light": "f47a5bb09fa4415416d01ca5f4164014cc1d8dc7be54ea888e5399277104e94c",
+    "safe-resize-handles-clamp-dark": "9cb3cb83d2aea4260fdbf1bc1d4281deecedeb9c9dbb0adbed921470b9aaf397",
+    "space-tab-drop-before-light": "19c699fd035030318ce578fdb6427d6243cd3f1d955ea0fbf958cad385e9c7db",
+    "space-tab-drop-after-dark": "1f802274c3015ad6422ee9b50a8d67a412407513da09de188be3db2f7a3873e4",
+    "plan-snap-endpoint-light": "2185d5ec6726e07097ba1a911984a11d5ca9b460a1cd1e7b2a719255b7d0ed0b",
+    "plan-snap-line-gaps-dark": "276eb10f32be938640bd68a1cf837494f11cce8d10703721831360f3a1100d23",
+    "wall-junctions-plan-preview-light": "d92aad64d7aa8641c6743b51a7d13d9166b15c49f3d8aee17b8e61ff263a57a6",
+    "wall-junctions-plan-t-dark": "45a98164ff93b01fbb7f3ac936ee8636c36dd791c09ac3b160b7c7ad803696d1",
    "wall-junctions-view-dark": "7b859c4f25f8a5dd4fca64d5b2f7aa64b65845fabbe83bc2388c2f99d29f71b1",
-    "junction-patch-resilience-plan-dark": "57ea7522c438e52292f226f975bb112930976b6e072b72322180d52ec0277f4f",
-    "junction-patch-resilience-view-dark": "1f0df26ed72bcc5bef06a8366d7043ad40b4a2bb744fa5a64248c29eae968424",
-    "wall-union-isolation-view-light": "291c045758be2814be88d12ab46bdc3d12cb99a03dbbcc9a1539c2c9a5931edf",
-    "wall-union-isolation-view-dark": "616fc6cc7144c9596ae52421027914e222f30f26de45215fa7e7b6175ca78543",
-    "multiwall-junction-bevel-view-dark": "e226d023fbab0502eb747395d43a46bb56bcf2be037ba4f9b7ad74ba406d9671",
-    "orthogonal-strip-cell-5-view-dark": "9b8e4bd22cbf1a82ff48f052822967c61179290a3234ae48ef547642329b5a90",
-    "orthogonal-strip-cell-1-view-dark": "e59e51ad3645144161459c438a07420730c4dcfd2c33bd2b18e8c3e57ea84515",
-    "wall-key-roundtrip-view-dark": "df46b4e209f98b97958748097ddc646ddc64d8285c2651762de71ec2456ac690",
+    "junction-patch-resilience-plan-dark": "90191f637f4d1345d82c63977513524fde353c4e3f87de1a723bf7d3b1f8e91f",
+    "junction-patch-resilience-view-dark": "afd83241d9a1e1f19ab59c3f1e6fa7af058c3e42a7fafa5ba271ff92ccea8f91",
+    "wall-union-isolation-view-light": "106f8ac97b82107fed36aa4456c0b9f7a39eeb44be86864b1d4f083497cdbd6e",
+    "wall-union-isolation-view-dark": "914451a813546189bdc9ac22dcf158bbc822b4403080a3c2fd4c6b02bb7780a4",
+    "multiwall-junction-bevel-view-dark": "6b02d1d0c5af8b386791cc5764b3bc407129f6576b6d9591c64fd388a8a6865d",
+    "orthogonal-strip-cell-5-view-dark": "66a288f7e7fc6228c3c63f10e1df8df0656ca0cd36681d998b126b03acb70b5a",
+    "orthogonal-strip-cell-1-view-dark": "c23e6d0410b8f5c2b7fb0707f6bea40408730af08f9e7a0b166aa8c0a3d6c85f",
+    "wall-key-roundtrip-view-dark": "d7b0749d0f6c0cfa74ad4d9f76d8a7b7962fadf4e2648260b5647548a988341c",
    "isometric-wall-junctions-dark": "d1956cbbde9a6a02953ce80eb8a0f74ca06ea268a4c60bb09b5b3981c26d9731",
-    "opening-placement-door-thick-wall-dark": "1157139aac7325b40e3869b8c3b5444509b4bc24a415ddf6f8d5402624f3a04a",
-    "opening-placement-passage-thick-wall-dark": "6d4a9a953b70401ca11cd6ce96c2e0e0781bbfff71e758dc57958a4163e2712d",
-    "opening-placement-passage-thick-wall-light": "b004b1395652c8a8eef5f5002b471ecf8f2f0347f158a14a056ff2b7382e4ea3",
-    "opening-symbol-room-wall-light": "562fed297210ef542de608e384c2d344dddd193a5b43615930c9f76faaf53b42",
+    "opening-placement-door-thick-wall-dark": "c21c2af812b847e7fd9a3a5b9df832db95266f81eba3d7b48c97d2b32619e7fe",
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    "card-editor-invalid-default-floor-light-en": "dbf251ece014cfee252e0dcb2d7c00eda66aa4b5bd125e4c83e248d4319d24b3",
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+    "span-over-door-migrated-dark": "a817f5baacf5ff80d1f236ffaa176cb6331b75423393dae5b16e54f67f37c7e0"
  }
 }
--- a/Show More
+++ b/Show More