ci: process gate as a script and a Validate job

PROCESS.md 10.2 describes scripts/process-gate.mjs; the script never existed.
Commits go straight to dev without PRs and GitHub blocks nothing on its side, so
until now the only thing standing between the process and rule #1 was the good
faith of whoever was committing. Hooks catch a violation on the author's machine
but --no-verify walks past them; this job is the catch-up pass that cannot be
skipped locally.

Checks 1-7 offline, 8 through gh, plus the escalation of check 3: a class A
commit with neither a spec file nor the `small` label is a failure, not a
warning. Check 8 is fail closed — an unreachable or closed issue is a refusal,
never a silent pass.

Two things surfaced while wiring it up and are recorded in the script header.
S8-merged had to join the allowed statuses: the pipeline merges into dev before
it moves the label, so Validate reads the issue already advanced and a strict set
would redden every accepted task. And the status question now applies only to
class A/B commits — asking it of a review document would fail every time, since
that document lands while the issue sits in S4-spec-review or S7-code-review.

Issue: #105
User-Visible: no

.github/workflows/validate.yml

@@ -32,6 +32,30 @@ jobs:
         run: |
           node scripts/validate-commit-provenance.mjs --check-hook-mode --github-range
 
+  # Догоняющая проверка процесса (PROCESS.md §10.3). Хуки ловят нарушение на
+  # машине автора, но их можно обойти `--no-verify`, а коммиты идут прямо в dev
+  # без PR — GitHub на своей стороне не блокирует ничего. Это последнее место,
+  # где нарушение правила №1 ловится машиной. Job независимый: краснеет сам и
+  # не роняет остальные, откат — удалить его отсюда, скрипт остаётся рабочим.
+  process-gate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with: { fetch-depth: 0 }
+      - uses: actions/setup-node@v4
+        with: { node-version: 22 }
+      - name: Process gate
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          BEFORE_SHA: ${{ github.event.before }}
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.sha }}
+          DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
+          # Публичный репозиторий: штатного токена хватает на чтение issue.
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          node scripts/process-gate.mjs --github-range --issues
+
   hacs:
     runs-on: ubuntu-latest
     steps: