ci(unit-tests): extend grep guard to async vi.mock with dynamic import

The pdfjs-dist literal grep added in 9260866f only caught one named
trigger of the birpc teardown race; the underlying mechanism (ADR 012 /
#553) is any async vi.mock factory whose body performs `await import(...)`.

Add a second PCRE-multiline grep matching that shape. Scoped to
**/*.{spec,test}.ts under frontend/src/, excluding __meta__ (which holds
the fixture strings exercising the meta-test). Defence in depth pairs with
the ESLint rule (saves at edit time) and the in-suite meta-test (catches
when tests run).

Verified locally with real GNU grep against a planted synthetic offender.

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

.gitea/workflows/ci.yml

@@ -39,10 +39,22 @@ jobs:
       - name: Assert no banned vi.mock patterns
         shell: bash
         run: |
+          # Literal pdfjs-dist (libLoader pattern — ADR 012)
           if grep -rF "vi.mock('pdfjs-dist'" frontend/src/; then
             echo "FAIL: banned vi.mock('pdfjs-dist') pattern found — see ADR 012. Use the libLoader prop injection pattern instead."
             exit 1
           fi
+          # Async factory with dynamic import in body (named mechanism — ADR 012 / #553).
+          # Multiline PCRE matches `vi.mock(<arg>, async ... { ... await import(...) ... })`
+          # across line breaks. __meta__ is excluded because it contains fixture strings
+          # demonstrating the very pattern this check is meant to forbid.
+          if grep -rPzln 'vi\.mock\([^)]+,\s*async[^{]*\{[\s\S]*?await\s+import\s*\(' \
+              --include='*.spec.ts' --include='*.test.ts' \
+              --exclude-dir='__meta__' \
+              frontend/src/; then
+            echo "FAIL: banned async vi.mock factory with dynamic import in body — see ADR 012 / #553. Use a synchronous factory + vi.hoisted instead."
+            exit 1
+          fi
 
       - name: Run unit and component tests with coverage
         shell: bash