feat(08-02): ci.yml fast-checks job

- on: pull_request + push branches:[main]; workflow env MILESTONE: v1.1
- fast-checks job: runs-on ubuntu-latest, if pull_request
- Node 22 via actions/setup-node@v4 + corepack enable pnpm
- No actions/cache (D-PROBE-04: times out on this runner)
- pnpm install --frozen-lockfile, lint (no-op), typecheck, PWA unit tests
- DB-backed pnpm test intentionally absent from this job

.gitea/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+env:
+  MILESTONE: v1.1
+
+jobs:
+  fast-checks:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+
+      - name: Enable pnpm
+        run: corepack enable pnpm
+
+      # actions/cache@v4 is intentionally omitted — probe (D-PROBE-04) showed it
+      # times out on this runner (socket hang-up between runner container and job
+      # container cache server). pnpm install without cache takes ~30s; acceptable.
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      # lint is currently a no-op: no package defines a `lint` script and ESLint is
+      # not installed. `pnpm -r lint` prints ERR_PNPM_RECURSIVE_RUN_NO_SCRIPT but
+      # exits 0, so this step passes. Wiring lint is out of this phase's scope.
+      - name: Lint
+        run: pnpm lint
+
+      - name: Typecheck
+        run: pnpm typecheck
+
+      - name: PWA unit tests
+        run: pnpm --filter @familysync/pwa test