v0.1.0-rc.3 Add MCP interface

✨ Features
- Added MCP server mode supporting stdio, SSE, and HTTP transports.
- Added area workflow support including kanban and now/later metadata.

♻️ Code Refactoring
- Implemented natural language tool outputs to reduce context bloat.
- Unified version injection at build time via main package.

📚 Documentation
- Updated AGENTS.md.
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