docs(01): create phase 1 plan — 5 plans in 4 waves

Research, pattern mapping, and verification complete.
Walking Skeleton mode active (MVP Phase 1).

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

.planning/STATE.md

@@ -3,12 +3,12 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 current_phase: —
-status: planning
-last_updated: "2026-05-21T19:31:20.618Z"
+status: executing
+last_updated: "2026-05-22T06:49:02.336Z"
 progress:
   total_phases: 5
   completed_phases: 0
-  total_plans: 0
+  total_plans: 5
   completed_plans: 0
   percent: 0
 ---
@@ -16,7 +16,7 @@ progress:
 # Project State
 
 **Project:** DocuVault
-**Status:** Planning
+**Status:** Ready to execute
 **Current Phase:** —
 **Last Updated:** 2026-05-21