- Add patch_callback parameter throughout the tool execution chain
- Add _render_patch_modal() to gui_2.py with colored diff display
- Add patch modal state variables to App.__init__
- Add request_patch_from_tier4() to trigger patch generation
- Add run_tier4_patch_callback() to ai_client.py
- Update shell_runner to accept and execute patch_callback
- Diff colors: green for additions, red for deletions, cyan for headers
- 36 tests passing
- Create src/patch_modal.py with PatchModalManager class
- Manage patch approval workflow: request, apply, reject
- Provide singleton access via get_patch_modal_manager()
- Add 8 unit tests for modal manager
- Add create_backup() to backup files before patching
- Add apply_patch_to_file() to apply unified diff
- Add restore_from_backup() for rollback
- Add cleanup_backup() to remove backup files
- Add 15 unit tests for all patch operations
- Create src/diff_viewer.py with parse_diff function
- Parse unified diff into DiffFile and DiffHunk dataclasses
- Extract file paths, hunk headers, and line changes
- Add unit tests for diff parser
- Add TIER4_PATCH_PROMPT to mma_prompts.py with unified diff format
- Add run_tier4_patch_generation function to ai_client.py
- Import mma_prompts in ai_client.py
- Add unit tests for patch generation
- Add minimax to PROVIDERS lists in gui_2.py and app_controller.py
- Add minimax credentials template in ai_client.py
- Implement _list_minimax_models, _classify_minimax_error, _ensure_minimax_client
- Implement _send_minimax with streaming and reasoning support
- Add minimax to send(), list_models(), reset_session(), get_history_bleed_stats()
- Add unit tests in tests/test_minimax_provider.py
- Fix mock_gemini_cli.py to use src/aggregate.py (moved to src directory)
- Add wait_for_event method to ApiHookClient for simulation tests
- Fix custom_callback path in app_controller to use absolute path
- Fix test_gui2_parity.py to use correct callback file path
