- Implemented diagnostics functionality to start, stop, and monitor background check commands. - Created a DiagnosticsPanel for real-time output display in the UI. - Added support for auto-detecting default diagnostics commands based on project configuration. - Introduced run_checks tool to execute project verification commands and report results. - Enhanced tools-extra with functions to parse AGENTS.md and package.json for check commands. - Added diff review functionality to visualize changes made in the last turn. - Implemented tests for diagnostics and run_checks functionalities to ensure reliability.