chore(conductor): Archive completed and deprecated tracks

- Moved codebase_migration_20260302 to archive

- Moved gui_decoupling_controller_20260302 to archive

- Moved test_architecture_integrity_audit_20260304 to archive

- Removed deprecated test_suite_performance_and_flakiness_20260302

conductor/archive/gui_decoupling_controller_20260302/metadata.json

@@ -0,0 +1,8 @@
+{
+  "track_id": "gui_decoupling_controller_20260302",
+  "type": "refactor",
+  "status": "new",
+  "created_at": "2026-03-02T22:30:00Z",
+  "updated_at": "2026-03-02T22:30:00Z",
+  "description": "Extract the state machine and core lifecycle into a headless app_controller.py, leaving gui_2.py as a pure immediate-mode view."
+}