* Remove r402-mcp from workspace members and dependencies
* Remove rmcp dependency from workspace
* Update README to remove MCP integration references and table entry
* Delete r402-mcp crate directory and all associated files
* Refactor Makefile with improved targets for build, check, test, bench, clippy, and fmt
* Separate clippy into check-only and auto-fix variants
* Add workspace-wide feature flags to build/test/bench commands