- Enable `-n auto` for all test commands in justfile (parallel execution)
- Add redis stack to test fixtures (missing stack was causing test failure)
- Replace hardcoded timeouts with constants: `TIMEOUT` (10s) and `SHORT_TIMEOUT` (5s)
- Rename `test-unit` → `test-cli` and `test-browser` → `test-web`
- Skip CLI startup test when running in parallel mode (`-n auto`)
- Update test assertions for 5 stacks (was 4)
