ci: add docs-sync-strict + i18n-ui-coverage jobs to ci.yml

Adds two strict drift gates that mirror (and harden) the new pre-commit
advisories from FASE 8:

  - docs-sync-strict: runs `npm run check:docs-all` (docs version sync,
    counts, env-doc contract, deprecated versions, and the new internal
    doc-links checker) plus the i18n translation-drift check in strict
    mode.
  - i18n-ui-coverage: enforces ≥80% UI message coverage across every
    configured locale.

Both jobs slot in immediately after `lint`, reusing the existing
setup-node@v6 + cache pattern. They are also wired into ci-summary
(`needs` + dashboard table) so the dashboard surfaces their status.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -41,6 +41,32 @@ jobs:
       - run: npm run typecheck:core
       - run: npm run typecheck:noimplicit:core
 
+  docs-sync-strict:
+    name: Docs Sync (Strict)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: ${{ env.CI_NODE_VERSION }}
+          cache: npm
+      - run: npm ci
+      - run: npm run check:docs-all
+      - name: i18n translation drift (strict)
+        run: node scripts/i18n/check-translation-drift.mjs
+
+  i18n-ui-coverage:
+    name: i18n UI Coverage
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: ${{ env.CI_NODE_VERSION }}
+          cache: npm
+      - run: npm ci
+      - run: node scripts/i18n/check-ui-keys-coverage.mjs --threshold=80
+
   i18n-matrix:
     name: Build language matrix
     runs-on: ubuntu-latest
@@ -462,6 +488,8 @@ jobs:
     if: always()
     needs:
       - lint
+      - docs-sync-strict
+      - i18n-ui-coverage
       - i18n
       - pr-test-policy
 
@@ -507,6 +535,8 @@ jobs:
           echo "| Job | Status |" >> "$GITHUB_STEP_SUMMARY"
           echo "|-----|--------|" >> "$GITHUB_STEP_SUMMARY"
           echo "| Lint | $(status '${{ needs.lint.result }}') |" >> "$GITHUB_STEP_SUMMARY"
+          echo "| Docs Sync (Strict) | $(status '${{ needs.docs-sync-strict.result }}') |" >> "$GITHUB_STEP_SUMMARY"
+          echo "| i18n UI Coverage | $(status '${{ needs.i18n-ui-coverage.result }}') |" >> "$GITHUB_STEP_SUMMARY"
           echo "| PR Test Policy | $(status '${{ needs.pr-test-policy.result }}') |" >> "$GITHUB_STEP_SUMMARY"
 
           echo "| SonarQube | $(status '${{ needs.sonarqube.result }}') |" >> "$GITHUB_STEP_SUMMARY"