diff --git a/.gitea/workflows/coverage-flake-probe.yml b/.gitea/workflows/coverage-flake-probe.yml
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+name: Coverage Flake Probe
+
+# Manually-triggered probe for the birpc teardown race documented in ADR 012
+# / #553. Runs the full coverage suite 20× in parallel against a single SHA
+# and asserts zero `[birpc] rpc is closed` lines across every cell. Verifies
+# the acceptance criterion that the race no longer surfaces under coverage.
+
+on:
+  workflow_dispatch:
+
+jobs:
+  coverage-flake-probe:
+    name: Coverage flake probe (run ${{ matrix.run }})
+    runs-on: ubuntu-latest
+    container:
+      image: mcr.microsoft.com/playwright:v1.58.2-noble
+    strategy:
+      fail-fast: false
+      matrix:
+        run: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache node_modules
+        id: node-modules-cache
+        uses: actions/cache@v4
+        with:
+          path: frontend/node_modules
+          key: node-modules-${{ hashFiles('frontend/package-lock.json') }}
+
+      - name: Install dependencies
+        if: steps.node-modules-cache.outputs.cache-hit != 'true'
+        run: npm ci
+        working-directory: frontend
+
+      - name: Compile Paraglide i18n
+        run: npx @inlang/paraglide-js compile --project ./project.inlang --outdir ./src/lib/paraglide
+        working-directory: frontend
+
+      - name: Run unit and component tests with coverage
+        shell: bash
+        run: |
+          set -eo pipefail
+          npm run test:coverage 2>&1 | tee /tmp/coverage-test-${{ github.run_id }}-${{ matrix.run }}.log
+        working-directory: frontend
+        env:
+          TZ: Europe/Berlin
+
+      - name: Assert no birpc teardown race
+        shell: bash
+        if: always()
+        run: |
+          if grep -qF "[birpc] rpc is closed" /tmp/coverage-test-${{ github.run_id }}-${{ matrix.run }}.log 2>/dev/null; then
+            echo "FAIL: [birpc] rpc is closed teardown race detected in run ${{ matrix.run }}"
+            grep -F "[birpc] rpc is closed" /tmp/coverage-test-${{ github.run_id }}-${{ matrix.run }}.log
+            exit 1
+          fi
+
+      - name: Upload coverage log on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-log-run-${{ matrix.run }}
+          path: /tmp/coverage-test-${{ github.run_id }}-${{ matrix.run }}.log