New E2E test files:
- e2e/health.spec.ts: 3 tests for health/observability endpoints
- e2e/history.spec.ts: 7 tests for history page
- e2e/plan.spec.ts: 7 tests for exercise plan page
- e2e/decision-engine.spec.ts: 8 tests for decision display and overrides
- e2e/cycle.spec.ts: 11 tests for cycle tracking, settings, and period logging
Total E2E tests: 100 (up from 64)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
