docs(02): create phase plan

.planning/STATE.md

@@ -4,7 +4,7 @@ milestone: v1.0
 milestone_name: milestone
 status: executing
 stopped_at: Phase 2 UI-SPEC approved
-last_updated: "2026-06-04T18:24:20.762Z"
+last_updated: "2026-06-04T19:09:54.699Z"
 last_activity: 2026-06-04 -- Phase 01 execution started
 progress:
   total_phases: 5
@@ -27,7 +27,7 @@ See: .planning/PROJECT.md (updated 2026-06-03)
 
 Phase: 01 (foundation-broker-spike) — EXECUTING
 Plan: 1 of 4
-Status: Executing Phase 01
+Status: Ready to execute
 Last activity: 2026-06-04 -- Phase 01 execution started
 
 Progress: [░░░░░░░░░░] 0%