docs(15): create phase plan

.planning/ROADMAP.md

@@ -883,10 +883,21 @@ Plans:
   3. Plugin README and docs stay application-neutral (`the application`, example names such as `blog`).
   4. The new code has unit tests, delivered in the phase's last plan.
 
-**Plans:** 0 plans
+**Plans:** 0/4 plans
 
 Plans:
-- [ ] TBD (run $gsd-plan-phase 15 to break down)
+
+**Wave 1**
+- [ ] 15-01-PLAN.md — Clone plugin, squashed `golem15_journal_*` schema, Translatable, host 3-plugin boot + CORS
+
+**Wave 2** *(blocked on Wave 1 completion)*
+- [ ] 15-02-PLAN.md — Admin YAML (`mlmarkdown`), FormatHTML, permissions/nav SVG, import/export
+
+**Wave 3** *(blocked on Wave 2 completion)*
+- [ ] 15-03-PLAN.md — `/_journal/api/v1`, buckets, backend Bearer writes, media, Typesense gate off
+
+**Wave 4** *(blocked on Wave 3 completion)*
+- [ ] 15-04-PLAN.md — Unit/integration tests last, PHPUnit map, phase gate, security review
 
 ### Phase 16: grzybyfunkcjonalne.pl on reusable blog views
 
@@ -949,7 +960,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 →
 | 14. Domain jobs and external integrations | 6/6 | In Progress|  |
 | 14.1. OAuth identities and fonoteka me routes (INSERTED) | 2/2 | Complete    | 2026-10-05 |
 | 14.2. Local Fonoteka frontend on local SummerCMS backend (INSERTED) | 0/TBD | Not started | - |
-| 15. Journal plugin | 0/TBD | Not started | - |
+| 15. Journal plugin | 0/4 | Ready to execute | - |
 | 16. grzybyfunkcjonalne.pl on reusable blog views | 0/TBD | Not started | - |
 | 20. Płytarium cutover | 0/TBD | Not started | - |