v0.9.0

Changelog

• 5361481 docs(mcp): add MCP guide and update READMEs
• 114e0c1 docs(readme): rewrite feature highlights with rationale
• 73ca6fa feat(hooks): introduce register_tool hook kind and manifest metadata
• 27b2c35 feat(mcp): add phi mcp CLI (list/add/remove/call/doctor)
• 16957fd feat(mcp): add stdio JSON-RPC client, lazy pool, and config
• efaa734 feat(mcp): wire mcp_list / mcp_inspect / mcp_call meta-tools
• 83fde1f fix(toolmanager): select compatible release assets
• b9c9d7b refactor(hooks): drop register_tool hook kind and manifest metadata
• fe4b2bb test(mcp): drop echoserver-based integration tests