## Summary
- Added a prominent callout in the E2E testing section making it clear
that `npm run build` must be run before E2E tests and re-run whenever
application (non-test) code changes
- Added a prominent callout in the Rules index section emphasizing that
relevant rule files must be read BEFORE writing any code or making
changes

## Test plan
- Documentation-only change, no functional impact

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>