chore: complete v1.3 milestone

- Added MILESTONES.md entry
- Evolved PROJECT.md with validated requirements
- Created milestone archive: milestones/v1.3-ROADMAP.md
- Updated STATE.md
- Tagged v1.3

.planning/STATE.md

@@ -2,19 +2,19 @@
 
 ## Project Reference
 
-See: .planning/PROJECT.md (updated 2026-02-02)
+See: .planning/PROJECT.md (updated 2026-02-04)
 
 **Core value:** Coordinate multiple Claude Code agents without losing track or stepping on each other.
-**Current focus:** v1.3 complete, ready for next milestone
+**Current focus:** Planning next milestone
 
 ## Current Position
 
-Phase: 15 of 15 (Frontend Wireframes) ✓
-Plan: All complete
-Status: Milestone v1.3 complete
-Last activity: 2026-02-02 — Phase 15 complete, v1.3 shipped
+Phase: All milestones complete (v1.0-v1.3)
+Plan: None active
+Status: Ready for next milestone
+Last activity: 2026-02-04 — v1.3 milestone archived
 
-Progress: ██████████ 100%
+Progress: ██████████ 100% (61 plans across 15 phases)
 
 ## Performance Metrics
 
@@ -198,6 +198,6 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-02-02
-Stopped at: Milestone v1.3 complete (61 plans total)
+Last session: 2026-02-04
+Stopped at: v1.3 archived, ready for next milestone
 Resume file: None