ci: run unit tests and smoke tests in CI

Previously the CI was only testing CLI invocation but not running pytest.

Changes:
- Install dev dependencies (pytest, mypy, ruff) in test jobs
- Run unit tests with: pytest tests/ -v -m 'not smoke'
- Run smoke tests with: pytest tests/smoke/ -v
- Both 'test' and 'test-npx-fallback' jobs now run full test suite

This ensures:
✅ Unit tests run on all platforms (ubuntu, windows) and Python versions (3.9, 3.13)
✅ Smoke tests verify end-to-end CLI functionality
✅ Both global install and npx fallback paths are tested

Author: mldangelo

.github/workflows/test.yml

@@ -126,8 +126,14 @@ jobs:
       - name: Pin Python version
         run: uv python pin ${{ matrix.python-version }}
 
-      - name: Install package
-        run: uv sync
+      - name: Install package with dev dependencies
+        run: uv sync --extra dev
+
+      - name: Run unit tests
+        run: uv run pytest tests/ -v -m 'not smoke'
+
+      - name: Run smoke tests
+        run: uv run pytest tests/smoke/ -v
 
       - name: Test CLI can be invoked
         run: uv run promptfoo --version
@@ -192,8 +198,14 @@ jobs:
       - name: Pin Python version
         run: uv python pin ${{ matrix.python-version }}
 
-      - name: Install package
-        run: uv sync
+      - name: Install package with dev dependencies
+        run: uv sync --extra dev
+
+      - name: Run unit tests
+        run: uv run pytest tests/ -v -m 'not smoke'
+
+      - name: Run smoke tests (with npx fallback)
+        run: uv run pytest tests/smoke/ -v
 
       - name: Test CLI fallback to npx (no global install)
         run: uv run promptfoo --version