- handlers/rfc.rs: Add handle_create, handle_get, handle_list,
handle_update_status, handle_plan as standalone functions
- handlers/status.rs: New module with handle_status, handle_next
- handlers/worktree.rs: Already had standalone functions
- handlers/mod.rs: Export status module
These standalone functions can be called by both MCP server and CLI,
avoiding code duplication (RFC 0061 architecture).
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>