Fix CI: use uv for test venv, gate builds on tests, reduce build triggers

- test.yml: use uv venv instead of pip --break-system-packages
- release.yml: inline test job that must pass before version bump;
  only triggers on source file changes (src/, src-tauri/, package.json)
- sidecar-release.yml: inline Python test job that must pass before
  sidecar version bump
- Both coordinators use `needs: test` so builds never start if tests fail

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -5,6 +5,7 @@ on:
     branches: [main]
   pull_request:
     branches: [main]
+  workflow_dispatch:
 
 jobs:
   python-tests:
@@ -13,12 +14,20 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install test dependencies
+      - name: Install uv
         run: |
-          pip install --break-system-packages pytest httpx pytest-asyncio anyio fastapi pydantic pyyaml uvicorn requests
+          if command -v uv &> /dev/null; then
+            echo "uv already installed: $(uv --version)"
+          else
+            curl -LsSf https://astral.sh/uv/install.sh | sh
+            echo "$HOME/.local/bin" >> $GITHUB_PATH
+          fi
 
       - name: Run pytest
-        run: python3 -m pytest backend/tests/ client/tests/ -v --tb=short
+        run: |
+          uv venv .testvenv
+          VIRTUAL_ENV=.testvenv uv pip install pytest httpx pytest-asyncio anyio fastapi pydantic pyyaml uvicorn requests
+          .testvenv/bin/python -m pytest backend/tests/ client/tests/ -v --tb=short
 
   frontend-tests:
     name: Frontend Tests