docs(phase-03): complete phase execution

.planning/STATE.md

@@ -2,9 +2,9 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: verifying
-stopped_at: Completed 03-04-PLAN.md
-last_updated: "2026-09-17T18:40:53.780Z"
+status: ready_to_plan
+stopped_at: Phase 03 complete (4/4) — ready to discuss Phase 4
+last_updated: 2026-09-17T18:50:48.688Z
 last_activity: 2026-09-17
 progress:
   total_phases: 15
@@ -21,13 +21,13 @@ progress:
 See: .planning/PROJECT.md (updated 2026-09-16)
 
 **Core value:** An existing WinterCMS-shaped app can be ported plugin by plugin to a single Go binary without its frontend noticing: the PHP version's API contract is the acceptance test.
-**Current focus:** Phase 03 — first-vertical-slice-genres-end-to-end
+**Current focus:** Phase 4 — cli scaffolding, i18n and mail
 
 ## Current Position
 
-Phase: 03 (first-vertical-slice-genres-end-to-end) — EXECUTING
-Plan: 4 of 4
-Status: Phase complete — ready for verification
+Phase: 4
+Plan: Not started
+Status: Ready to plan
 Last activity: 2026-09-17
 
 Progress: [██████████] 100%
@@ -36,7 +36,7 @@ Progress: [██████████] 100%
 
 **Velocity:**
 
-- Total plans completed: 14
+- Total plans completed: 18
 - Average duration: 21 min
 - Total execution time: 104 min
 
@@ -46,6 +46,7 @@ Progress: [██████████] 100%
 |-------|-------|-------|----------|
 | 01 | 4 | - | - |
 | 02 | 5 | - | - |
+| 03 | 4 | - | - |
 
 **Recent Trend:**