- Fix SerpAPI error (paid service, not free)
- Add Brave Search API as primary (reliable JSON API)
- Add LRU cache with max 1000 entries and size limits
- Add template-aware TTL (pricing 7d, errors 12h, docs 24h, general 1h)
- Add errors template to config example
- Add date_range limitations note (Google/Bing only)
- Add performance testing and memory usage targets
- Add risks: E3 HTML fragility and rate limiting
- Include brave-api.org in references
- Add revision history section
- Fix architecture diagram indentation
- Update engine priority order in config

- Fixed typo: 'freequeries' -> 'free queries' spacing
- Corrected internal entity references (E3 -> E1)
- Unified engine configuration (removed redundant engineOrder)
- Made response limits consistent (default 15 both places)
- Added 'general' template to config example
- Resolved Open Question #3 (marked as RESOLVED)
- Clarified cache storage (file + in-memory LRU)
- Clarified extract_content limits (first 5KB)
- Updated revision history to v1.2

Phase 1: Multi-engine foundation with caching and fallback

**Features implemented:**
- Multi-engine architecture (Brave, Google, Bing, DuckDuckGo)
- LRU cache with max 1000 entries and TTL support
- Enhanced configuration system with web search settings
- Plugin-based engine registry with automatic fallback
- Updated tool registration with backward compatibility

**Engine priority:** Brave (recommended) > Google > Bing > DuckDuckGo (fallback)
**Configuration:** Support for API keys via .env file
**Documentation:** Comprehensive API key guide and setup instructions

**Ready for testing:** Users can configure multiple search engines
  for improved reliability and result quality

Wingman: Codi <codi@layne.pro>

- Add configurable timeout via AbortSignal.timeout()
- Default timeout is undefined (no limit) for flexibility
- Can be configured via WebSearchConfig.timeout (milliseconds)
- Applied to all 4 engines: Brave, Google, Bing, DuckDuckGo