chore: mark v1.3 NPM Packaging milestone complete

All 3 phases (10-12) executed and verified. Package published.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: thiagofinch

.planning/STATE.md

@@ -1,14 +1,14 @@
 ---
 gsd_state_version: 1.0
-milestone: v1.0
-milestone_name: milestone
-status: completed
-last_updated: "2026-02-27T20:46:01.100Z"
+milestone: v1.3
+milestone_name: NPM Packaging
+status: milestone_complete
+last_updated: "2026-02-27T21:05:00.000Z"
 progress:
   total_phases: 12
-  completed_phases: 10
+  completed_phases: 12
   total_plans: 17
-  completed_plans: 16
+  completed_plans: 17
 ---
 
 # Project State: Mega Brain Pipeline Hardening