docs(phase-20): update tracking after wave 4

.planning/ROADMAP.md

@@ -1533,7 +1533,7 @@ Plans:
   3. The demo is deployed publicly: the frontend is open, `/backend` is not reachable from the public internet, and the site carries a "want to see the backend? contact Golem15" call to action.
   4. The new code has unit tests, delivered in the phase's last plan.
 
-**Plans:** 3/6 plans executed
+**Plans:** 4/6 plans executed
 
 Plans:
 **Wave 1**
@@ -1546,7 +1546,7 @@ Plans:
 - [x] 20-03-PLAN.md — vue-chat-layer v0.1.0 (bm port, channels, threads, pins, command picker, link embeds) and /chat, floating panel, Chat tour card in vue-demo-app
 
 **Wave 4** *(blocked on Wave 3 completion)*
-- [ ] 20-04-PLAN.md — vue-forum-layer, vue-userfriends-layer, vue-chatvideo-layer v0.1.0 (DM-only call button), their pages and tour cards, herald VAPID config without UI
+- [x] 20-04-PLAN.md — vue-forum-layer, vue-userfriends-layer, vue-chatvideo-layer v0.1.0 (DM-only call button), their pages and tour cards, herald VAPID config without UI
 
 **Wave 5** *(blocked on Wave 4 completion)*
 - [ ] 20-05-PLAN.md — rome deploy: the demo's own LiveKit, Vuurmuur rule (checkpoint), nginx, .env keys, Centrifugo, release, DEPLOY.md, check-deploy and check-live
@@ -1804,7 +1804,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 →
 | 19.6.1. Backend Administrators screen (INSERTED) | 5/5 | Complete    | 2026-10-22 |
 | 19.7. Generic MCP module | 9/9 | In Progress|  |
 | 19.8. Console commands overhaul (INSERTED) | 6/6 | In Progress|  |
-| 20. Demo instance with every shared plugin | 3/6 | In Progress|  |
+| 20. Demo instance with every shared plugin | 4/6 | In Progress|  |
 | 30. Płytarium cutover | 0/TBD | Not started | - |
 | 31. Chat polish against WavePath clients | 0/TBD | Not started | - |
 | 32. SEO foundation | 6/6 | In Progress|  |