docs(15): create phase plan

.planning/STATE.md

@@ -1,18 +1,18 @@
 ---
 gsd_state_version: "1.0"
 milestone: v1.0
-current_phase: 14.2.1
-current_phase_name: Translate plugin (INSERTED)
+current_phase: 15
+current_phase_name: journal-plugin
 status: executing
 stopped_at: Completed 14.2.1-06-PLAN.md
-last_updated: "2026-10-06T14:29:39.010Z"
+last_updated: "2026-10-06T16:01:39.445Z"
 last_activity: 2026-10-06
-last_activity_desc: Phase 14.2.1 execution started
-state_head: ef0301631448e7e287c4f68ea3f16eb7ae2004c1
+last_activity_desc: Phase 15 planned (4 plans)
+state_head: d9f0f47e470c25226d601048a66bcceeea516148
 progress:
   total_phases: 26
   completed_phases: 12
-  total_plans: 131
+  total_plans: 135
   completed_plans: 131
 milestone_name: milestone
 ---
@@ -24,16 +24,16 @@ milestone_name: milestone
 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 14.2.1 — Translate plugin (INSERTED)
+**Current focus:** Phase 15 — Journal plugin
 
 ## Current Position
 
-Phase: 14.2.1 (Translate plugin (INSERTED)) — EXECUTING
-Plan: 6 of 6 complete
-Status: Ready for phase verification
-Last activity: 2026-10-06 — Completed 14.2.1-06-PLAN.md
+Phase: 15 (journal-plugin) — READY TO EXECUTE
+Plan: 0 of 4 complete
+Status: Ready to execute
+Last activity: 2026-10-06 — Phase 15 planned (4 plans)
 
-Progress: [██████████] 100%
+Progress: [░░░░░░░░░░] 0%
 
 ## Performance Metrics