fix(process): integrate runs every pipeline script from one dev snapshot (#749)

The body of _process.yml is read from dev (@dev, #623), so the flags and
formats it passes to scripts are dev's. After "Опубликовать документ ревью"
the working copy of job integrate is the task branch, and a show/ship branch
with a clean merge is not rebased before review: its scripts/ may lag dev by
days. review-doc-guard.mjs silently ignores unknown flags (the anchor lost
#726 route and #737 usage), and a stale merge-candidate.mjs merges the old
way. Only two calls (#723 push refusal, #726 route) were taken from dev, each
with its own extraction, and on ship/reuse the remaining ones ran dev's
version anyway: the script version depended on the path.

Now one step right after setup-node extracts
`git archive origin/dev scripts .github/workflows/validate.yml` into
$RUNNER_TEMP/dev-tools and every repo script of the job runs from there via
TOOLS (review-result-gate, review-doc-guard, reviews-index, merge-candidate,
process-track route, status-label). validate.yml is part of the snapshot
because workflow-jobs.mjs reads it relative to itself; without it ci-proof
answers `failed (#622)` and every code merge would return to S6. The working
copy stays the material: git, the document and paths are judged there.

PROCESS.md §10.4 gets the paragraph "Скрипты конвейера — из dev": the
model_review exception, merges of pipeline changes judged by dev's version,
and compatible edits of the Validate proof contract.

Tests: test/process-integrate-tools.test.mjs is the job contract (no step
calls scripts/ from the working copy, every call goes through the snapshot,
one archive from origin/dev with validate.yml, and the step as is yields a
directory where ci-proof resolves the job contract); publish-push-refusal
runs the publish step and the #413 step on real bash with a task branch whose
review-doc-guard.mjs exits 7 (red with the old call). Existing harnesses take
the snapshot step before the publish and decide steps; the #706 mutant anchor
follows the status-label call.

Issue: #749
User-Visible: no
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd

scripts/mutation-registry.mjs

@@ -4100,7 +4100,7 @@ const MUTANT_DEFINITIONS = [
       + 'combined gh call that stripped S7-code-review on rereview',
     patches: [{
       file: '.github/workflows/_process.yml',
-      find: '          node scripts/status-label.mjs --repo="${{ github.repository }}" \\\n            --issue="$NUM" --from="$FROM" --to="$TO"\n',
+      find: '          node "$TOOLS/scripts/status-label.mjs" --repo="${{ github.repository }}" \\\n            --issue="$NUM" --from="$FROM" --to="$TO"\n',
       replace: '          gh issue edit "$NUM" --repo "${{ github.repository }}" \\\n            --add-label "$TO" --remove-label "$FROM"\n',
     }],
   },