DEVX-129: feat: test isolation pytest plugin, shift-left quality gates, dep upgrades

docs/tech/architecture.md

@@ -41,6 +41,7 @@ src/devx/
 │   ├── setup.py             # Environment setup (venv, deps, hooks, tea login)
 │   ├── install_tools.py     # Install actionlint, git-cliff, act_runner, tea
 │   ├── check_test_speed.py  # Measure unit test execution time
+│   ├── check_test_isolation.py  # Pytest plugin: detect un-hermetic test patterns
 │   ├── configure_repo.py    # Branch protection and label setup
 │   ├── generate_badges.py   # Badge SVG generation
 │   ├── generate_cliff_config.py  # Generate cliff.toml with correct prefix
@@ -331,6 +332,15 @@ total suite time must not exceed `--max-seconds` (default: 10s), and no
 individual test may exceed `--max-single-seconds` (default: 0.5s, 0 to
 disable). Runs `make test-unit` with `PYTEST_ADDOPTS=--durations=0`.
 
+### `check_test_isolation.py`
+
+Pytest plugin (auto-discovered via `pytest11` entry point) that
+statically analyzes test files for un-hermetic patterns causing slow
+or flaky tests: unpatched `subprocess.run`/`time.sleep` calls, known
+subprocess-spawning helpers called without `@patch`, and excessive
+loop iterations (>100). Also available as a standalone CLI for CI
+gates and pre-commit hooks. See ADR-0001 for design rationale.
+
 ### `configure_repo.py`
 
 Configures repository branch protection and labels via the Gitea REST API.