Add CLAUDE.md and AGENTS.md for AI-assisted development guidance,
analysis report with screenshots, and Playwright-based e2e test for
signal cancellation flow.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Remove unused login helper in portfolio.spec.ts
- Add eslint-disable for useEffect in history page
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>