docs: design doc for fup og fakta game engine + platform architecture

Captures all brainstormed decisions:
- Pluggable game cartridge platform (GameDriver interface)
- Celery + Redis timer-driven phase transitions
- Session owner play/pause/exit controls (no skip)
- Escalating scoring per round, incremental reveal scoring
- Emoji reactions during guess phase → post-game awards
- Relational per-user config presets with game-specific models
- Ephemeral game state (no persistence after exit/finish)
- Full WebSocket event reference and data lifecycle

Also: updated TODO.md (WebSocket done, persisted answers done),
created CLAUDE.md, and PROMPT.md for ralph-loop.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TODO.md

@@ -37,8 +37,8 @@ Byg **Weirsøe Party Protocol**: en dansk party-webapp platform ala Jackbox, hvo
   - [x] `core_admin` (global administration)
   - [x] `fupogfakta` (Spil 1)
   - [x] `lobby` (room/session/player join flow)
-  - [x] `realtime` (channels events, game state broadcast)
-  - [x] `voice` (fælles voice-acting interface)
+  - [x] `realtime` (app-skelet oprettet — consumers/routing IKKE implementeret endnu)
+  - [x] `voice` (fælles voice-acting interface — stub)
 - [x] Miljøfiler (`.env.test`, `.env.prod` skabeloner)
 - [x] Konfig for MySQL test/prod
 
@@ -53,14 +53,15 @@ Byg **Weirsøe Party Protocol**: en dansk party-webapp platform ala Jackbox, hvo
 - [x] `ScoreEvent` (auditérbar pointslog)
 
 ### Fase 3 — Spilflow `Fup og Fakta`
-- [x] Lobby: host opretter session, spillere joiner via kode
-- [x] Runde starter med kategori
-- [x] Spørgsmål vises -> alle skriver løgn inden X sek
-- [x] System blander korrekt svar + løgne
-- [x] Guessfase: alle gætter inden Z sek
-- [x] Pointudregning (konfigurerbar pr. runde)
-- [x] Scoreboard + næste spørgsmål/runde
-- [x] Slutresultat
+- [x] Lobby: host opretter session, spillere joiner via kode (REST)
+- [x] Runde starter med kategori (REST)
+- [x] Spørgsmål vises -> alle skriver løgn inden X sek (REST)
+- [x] System blander korrekt svar + løgne (persisted i JSONField, anti-cheat dedup)
+- [x] Guessfase: alle gætter inden Z sek (REST)
+- [x] Pointudregning (konfigurerbar pr. runde, ScoreEvent audit trail)
+- [x] Scoreboard + næste spørgsmål/runde (REST)
+- [x] Slutresultat (REST)
+- [x] **WebSocket push af phase-events til host + spillere** (GameConsumer + broadcast.py, InMemoryChannelLayer i tests)
 
 ### Fase 4 — Voice-acting (platformkrav)
 - [ ] Definér TTS provider-interface
@@ -103,10 +104,10 @@ Byg **Weirsøe Party Protocol**: en dansk party-webapp platform ala Jackbox, hvo
 - [ ] Migrations + static + health checks
 
 ### Backlog — Need-to-have / Nice-to-have
-- [ ] (Need-to-have) Persistér mixed svarrækkefølge pr. round question, så alle spillere ser samme rækkefølge ved reconnect/refresh
+- [x] (Need-to-have) Persistér mixed svarrækkefølge pr. round question — DONE (JSONField + migration 0003 + test)
 - [x] (Need-to-have) Tilføj spiller-auth/session-token for submit_lie (pt. baseret på player_id i payload)
 - [ ] (Nice-to-have) Endpoint til status/progress i løgnfasen (antal indsendt ud af total)
-- [ ] (Need-to-have) [Fejltype: CI/lint F401] [Fil/område: core_admin/*, fupogfakta/tests.py+views.py, lobby/admin.py+models.py, realtime/*, voice/*] [Branch/PR: feature/f3-lobby-create-join, feature/fase0-mvp-fup-og-fakta, feature/lobby-mvp (ingen åbne PRs fundet)] Fjern ubrugte scaffold-imports (eller kør ruff check --fix) så quality gate kan blive grøn før merge.
+- [ ] (Need-to-have) Fjern ubrugte scaffold-imports i core_admin/*, realtime/*, voice/*, fupogfakta/views.py (kør `ruff check --fix`) så CI quality gate er grøn
 - [x] (Need-to-have) [Issue #251] Release-often lane: SPA MVP opdelt i 3 merge-klare micro-PR batches (plan + acceptance criteria dokumenteret i `docs/ISSUE-251-RELEASE-OFTEN-SPA-MVP-BATCH-PLAN.md`).
 - [ ] (Need-to-have) Rate limiting på join/submit endpoints
 - [ ] (Need-to-have) Session-kode brute-force beskyttelse