ci: unit, e2e, and backend-test jobs

quality keeps typecheck + web build and uploads the bundle. unit runs
vitest (node + Chromium browser projects) and blocks PRs. e2e boots
the CPU backend with fake TTS and runs Playwright against the preview
build — informational until it has a sustained green run, then flip
continue-on-error off. backend-tests runs the existing pytest suite
for the first time in CI, also informational.

.github/workflows/ci.yml

@@ -7,9 +7,8 @@ on:
       - main
 
 jobs:
-  frontend-quality:
+  quality:
     runs-on: ubuntu-latest
-
     steps:
       - uses: actions/checkout@v4
 
@@ -22,5 +21,115 @@ jobs:
       - name: Typecheck app + web
         run: bun run typecheck
 
-      - name: Build web smoke test
+      - name: Build web
         run: bun run build:web
+
+      - name: Upload web build
+        uses: actions/upload-artifact@v4
+        with:
+          name: web-dist
+          path: web/dist
+          retention-days: 1
+
+  unit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Cache Playwright browsers
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/ms-playwright
+          key: playwright-${{ runner.os }}-${{ hashFiles('bun.lock') }}
+
+      - name: Install Chromium
+        run: bunx playwright install chromium --with-deps
+
+      - name: Vitest (unit + browser)
+        run: bunx vitest run
+
+  e2e:
+    # Informational while the suite beds in; flip to blocking once it has
+    # a sustained green run.
+    continue-on-error: true
+    needs: quality
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+          cache: pip
+          cache-dependency-path: backend/requirements-ci.txt
+
+      - name: Install backend (CPU)
+        run: |
+          pip install torch --index-url https://download.pytorch.org/whl/cpu
+          pip install -r backend/requirements-ci.txt
+
+      - name: Cache Playwright browsers
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/ms-playwright
+          key: playwright-${{ runner.os }}-${{ hashFiles('bun.lock') }}
+
+      - name: Install Chromium
+        run: bunx playwright install chromium --with-deps
+
+      - name: Playwright E2E
+        run: bunx playwright test -c e2e
+        env:
+          VOICEBOX_PYTHON: python
+
+      - name: Upload Playwright report
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-report
+          path: |
+            playwright-report
+            test-results
+          retention-days: 7
+
+  backend-tests:
+    # Informational: 30 pre-existing pytest files that have never run in CI.
+    continue-on-error: true
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+          cache: pip
+          cache-dependency-path: backend/requirements-ci.txt
+
+      - name: Install backend (CPU)
+        run: |
+          pip install torch --index-url https://download.pytorch.org/whl/cpu
+          pip install -r backend/requirements-ci.txt
+          pip install pytest pytest-asyncio
+
+      - name: Pytest
+        run: python -m pytest backend/tests -v --ignore=backend/tests/test_all_models_e2e.py