feat(mesh): guild-sync-ready channels on create/delete gossip (Phase 800)

Channel and channel-delete wire events emit structural channel slices for mesh peers.

Co-authored-by: Cursor <[email protected]>

README.md

@@ -2,6 +2,8 @@
 
 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 800 (v0.8.767):** `guild-sync-ready` `channels` on channel create/delete gossip. Bundle: `npm run test:ci-phase800`.
+
 **Phase 799 (v0.8.766):** Reuses Phase 794 channel-settings gossip + GUILD_SYNC slices for triple-peer slowmode. Bundle: `npm run test:ci-phase799`.
 
 **Phase 797 (v0.8.764):** `guild-sync-ready` `channelTopic` on channel-update gossip. Bundle: `npm run test:ci-phase797`.

mixins/runtime/guild-sync/platform-guild-wire-mixin.js

@@ -124,6 +124,8 @@ _wireGuild (guildInstance) {
   guildInstance.on('channel', (ch) => {
     this._fanoutBotEvent(BOT_EVENTS.CHANNEL_CREATE, { channel: ch })
     this.emit('channel', ch)
+    const gid = this.guild?.guild?.id
+    if (gid) this.emit('guild-sync-ready', { guildId: gid, channels: 1 })
   })
   guildInstance.on('channel-delete', (p) => {
     if (p?.channelId && p.channelId === this.activeChannelId) {
@@ -135,6 +137,8 @@ _wireGuild (guildInstance) {
       })
     }
     this.emit('channel-delete', p)
+    const gid = this.guild?.guild?.id
+    if (gid) this.emit('guild-sync-ready', { guildId: gid, channels: 1 })
   })
   guildInstance.on('pin', (p) => {
     this.emit('pin', p)