chore(conductor): Archive track 'mma_agent_focus_ux_20260302'

conductor/tracks.md

@@ -10,6 +10,9 @@ This file tracks all major tracks for the project. Each track has its own detail
 
 ## Completed / Archived
 
+- [x] **Track: MMA Agent Focus UX**
+*Link: [./archive/mma_agent_focus_ux_20260302/](./archive/mma_agent_focus_ux_20260302/)*
+
 - [x] **Track: Architecture Boundary Hardening**
 *Link: [./archive/architecture_boundary_hardening_20260302/](./archive/architecture_boundary_hardening_20260302/)*