* docs: add AI SDK integration documentation
- Add comprehensive AI SDK documentation in docs/sdks/integrations/ai-sdk.md
- Detailed description of all three memory tools (retain, recall, reflect)
- Complete parameter documentation and return types
- Advanced usage patterns (streaming, multi-user, ToolLoopAgent)
- HTTP client example for zero-dependency usage
- TypeScript types and API reference
- Best practices and system prompt examples
- Update AI SDK README to brief quickstart with link to docs
- Single source of truth: comprehensive docs in documentation site
- README now focuses on quick setup and points to full docs
- Maintains features list and basic example for npm page
* fix
