fix(guild): protomux v3 gossip wire via pearcord-drive/mux-wire

Gossip mesh now uses c.buffer addMessage + wire.send so live P2P message
sync works in Bare (test:gossip-live). Only store mesh sessions when
createChannel succeeds; same pattern for attach/voice/screen channels.

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

index.js

@@ -644,9 +644,9 @@ class PearcordGuild extends EventEmitter {
       const peerId = b4a.toString(conn.remotePublicKey, 'hex')
       this.peers.set(peerId, conn)
       const ch = attachGossipMesh(this, conn)
-      this._channels.set(peerId, ch)
+      if (ch) this._channels.set(peerId, ch)
       const attachCh = attachDriveMesh(this, conn, () => this._attachmentProvider)
-      this._attachChannels.set(peerId, attachCh)
+      if (attachCh) this._attachChannels.set(peerId, attachCh)
       if (this._voiceMediaHub) {
         const voiceCh = attachVoiceMesh(this, conn, this._voiceMediaHub)
         if (voiceCh) this._voiceChannels.set(peerId, voiceCh)

mesh.js

@@ -4,6 +4,7 @@ const Protomux = require('protomux')
 const b4a = require('b4a')
 const c = require('compact-encoding')
 const { RPC, encodeRpc, decodeRpc } = require('pearcord-shared')
+const { openWireChannel } = require('pearcord-drive/mux-wire')
 
 const GOSSIP_PROTOCOL = 'pearcord-gossip-v1'
 
@@ -11,12 +12,9 @@ const rpcPayload = c.json
 
 function attachGossipMesh (guild, conn) {
   const mux = Protomux.from(conn)
-  const channel = mux.createChannel({
+  return openWireChannel(mux, {
     protocol: GOSSIP_PROTOCOL,
-    onopen () {
+    ondata (buf) {
-      channel.open()
-    },
-    onmessage (buf) {
       let packet
       try {
         packet = decodeRpc(buf)
@@ -27,18 +25,17 @@ function attachGossipMesh (guild, conn) {
       }
     }
   })
-  return channel
 }
 
 async function broadcastGossip (guild, method, payload) {
   const buf = encodeRpc(method, b4a.from(JSON.stringify(payload)))
-  const channels = [...guild._channels.values()]
+  const sessions = [...guild._channels.values()]
   await Promise.all(
-    channels.map(async (ch) => {
+    sessions.map(async (session) => {
       try {
-        const ok = await ch.fullyOpened().catch(() => false)
+        const ok = await session.fullyOpened().catch(() => false)
         if (!ok) return
-        ch.send(buf)
+        session.send(buf)
       } catch {
         // peer gone
       }
@@ -46,4 +43,4 @@ async function broadcastGossip (guild, method, payload) {
   )
 }
 
-module.exports = { attachGossipMesh, broadcastGossip, GOSSIP_PROTOCOL }
+module.exports = { attachGossipMesh, broadcastGossip, GOSSIP_PROTOCOL, rpcPayload }