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 Application facade: one `PearcordPlatform` class that wires identity, database, guild mesh, DMs, invites, voice, discovery, bots, and dozens of feature modules for the Pearcord desktop sidecar and companion. **Mixin sources:** [`mixins/README.md`](mixins/README.md) — `domain/`, `json-export/`, `runtime/{core,mesh,guild-sync,search-discovery,partition-heal,view,voice-dm,features}/`. Architecture: [PLATFORM_MIXINS.md](../../docs/PLATFORM_MIXINS.md). Regenerate after manifest edits: `cd apps/pearcord && npm run regenerate:platform-mixins`. OTA prestage recursively verifies symbols under `mixins/` — [RELEASE.md](../../docs/RELEASE.md#prestage-sync-file-deps).
 
+**Phase 845 (v0.8.812):** Quad-peer channel topic uses Phase 797/798 topic gossip on 4-peer mesh. Bundle: `npm run test:ci-phase845`.
+
 **Phase 844 (v0.8.811):** Quad-peer custom stickers use Phase 791/803 sticker gossip on 4-peer mesh. Bundle: `npm run test:ci-phase844`.
 
 **Phase 843 (v0.8.810):** Quad-peer custom emoji uses Phase 790/802 emoji gossip on 4-peer mesh. Bundle: `npm run test:ci-phase843`.