feat(test): add developer quality gate consolidation (G-007)

- Add scripts/test-integration-fast.sh for fast integration tests
- Add scripts/test-coverage.sh with 12% baseline threshold
- Update Makefile with test-integration-fast, test-coverage, test-all-local
- Update CI workflow with integration and coverage jobs
- Add smoke marker to pytest.ini
- Update tests/README.md with quality gate layers documentation
- Add tests/integration/pipeline/ for pipeline stage-chain tests

Quality gate layers:
- Quick: ruff + unit + smoke (~2 min)
- Fast Integration: SQLite/API/Pipeline (~3 min)
- Coverage: 12% threshold gate (~8 min)
- Full Local: all three combined

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/run-tests.yml

@@ -10,6 +10,7 @@ on:
       - 'pyproject.toml'
       - 'uv.lock'
       - 'run_tests.sh'
+      - 'scripts/test-*.sh'
   push:
     branches:
       - master
@@ -21,10 +22,11 @@ on:
       - 'pyproject.toml'
       - 'uv.lock'
       - 'run_tests.sh'
+      - 'scripts/test-*.sh'
 
 jobs:
   test:
-    name: Run Unit Tests
+    name: Unit Tests
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -41,28 +43,13 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install uv
-        run: |
-          curl -LsSf https://astral.sh/uv/install.sh | sh
-          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+        uses: astral-sh/setup-uv@v4
 
       - name: Install dependencies
-        run: |
-          uv sync --dev
+        run: uv sync --dev
 
-      - name: Run unit tests
-        run: |
-          bash run_tests.sh
-
-      - name: Upload coverage to Codecov
-        if: matrix.python-version == '3.12'
-        uses: codecov/codecov-action@v5
-        with:
-          files: ./coverage.xml
-          flags: unit-tests
-          name: unit-tests-coverage
-          fail_ci_if_error: false
-        env:
-          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      - name: Run unit + smoke tests
+        run: uv run pytest tests/unit_tests/ tests/smoke/ -q --tb=short
 
       - name: Test Summary
         if: always()
@@ -71,3 +58,79 @@ jobs:
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "Python Version: ${{ matrix.python-version }}" >> $GITHUB_STEP_SUMMARY
           echo "Test Status: ${{ job.status }}" >> $GITHUB_STEP_SUMMARY
+
+  integration:
+    name: Fast Integration Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Run fast integration tests
+        run: uv run pytest tests/integration/ -m "not slow" -q --tb=short
+
+      - name: Integration Test Summary
+        if: always()
+        run: |
+          echo "## Integration Tests Results" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "Test Status: ${{ job.status }}" >> $GITHUB_STEP_SUMMARY
+
+  coverage:
+    name: Coverage Gate
+    runs-on: ubuntu-latest
+    needs: [test, integration]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Run coverage (unit + smoke)
+        run: |
+          uv run pytest tests/unit_tests/ tests/smoke/ \
+            --cov=langbot \
+            --cov-report=xml \
+            --cov-report=term-missing \
+            --cov-fail-under=12 \
+            -q --tb=short
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          files: ./coverage.xml
+          flags: unit-tests
+          name: coverage-report
+          fail_ci_if_error: false
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
+      - name: Coverage Summary
+        if: always()
+        run: |
+          echo "## Coverage Results" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "Threshold: 12%" >> $GITHUB_STEP_SUMMARY
+          echo "Status: ${{ job.status }}" >> $GITHUB_STEP_SUMMARY