* docs: Update AI documentation for accurate codebase reflection
- Replace obsolete POLLING_ARCHITECTURE.md with DATA_FETCHING_ARCHITECTURE.md
- Rewrite API_NAMING_CONVENTIONS.md with file references instead of code examples
- Condense ARCHITECTURE.md from 482 to 195 lines for clarity
- Update ETAG_IMPLEMENTATION.md to reflect actual implementation
- Update QUERY_PATTERNS.md to reflect completed Phase 5 (nanoid optimistic updates)
- Add PRPs/stories/ to .gitignore
All documentation now references actual files in codebase rather than
embedding potentially stale code examples.
* docs: Update CLAUDE.md and AGENTS.md with current patterns
- Update CLAUDE.md to reference documentation files instead of embedding code
- Replace Service Layer and Error Handling code examples with file references
- Add proper distinction between DATA_FETCHING_ARCHITECTURE and QUERY_PATTERNS docs
- Include ETag implementation reference
- Update environment variables section with .env.example reference
* docs: apply PR review improvements to AI documentation
- Fix punctuation, hyphenation, and grammar issues across all docs
- Add language tags to directory tree code blocks for proper markdown linting
- Clarify TanStack Query integration (not replacing polling, but integrating it)
- Add Cache-Control header documentation and browser vs non-browser fetch behavior
- Reference actual implementation files for polling intervals instead of hardcoding values
- Improve type-safety phrasing and remove line numbers from file references
- Clarify Phase 1 removed manual frontend ETag cache (backend ETags remain)
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