- Add docs/TESTING.md with 10 BDD testing best practices
- Add createNote() helper to fixtures to DRY up state setup
- Add createChecklistNote() helper in checklist tests
- Rename scenario titles to describe outcomes, not actions
- Replace imperative Given steps with createNote() helper
- Fix fragile conditional in tag filtering test (silent pass)
- Remove implementation details from Gherkin comments
- Improve Given/When/Then rhythm consistency across all tests
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
