feat(phase699): emoji registry CSV and sticker pack export mesh parity (v0.8.674)

Add signed emoji registry CSV mesh (RPC 116) and sticker pack export CSV (RPC 117)
with emoji-csv UI, platform mixin, delivery receipts, ui-flow IPC, agentctl journeys,
and test:ci-phase699 regression bundle including phase698 chain.

index.js

@@ -2728,6 +2728,36 @@ async function dispatchUiMessage (platform, msg, hooks = {}) {
     }
     return true
   }
+  if (t === 'emoji-csv-modal-open') {
+    pushState()
+    send({ type: 'emoji-csv-modal-opened' })
+    return true
+  }
+  if (t === 'sync-emoji-registry-csv') {
+    const out = await platform.pushEmojiRegistryCsvToMesh()
+    pushState()
+    send({ type: 'emoji-registry-csv-synced', ...out })
+    if (platform.mode === 'guild' && platform.activeChannelId) {
+      send({ type: 'composer-focus-channel', channelId: platform.activeChannelId })
+    }
+    return true
+  }
+  if (t === 'clear-emoji-registry-csv') {
+    await platform.clearEmojiRegistryCsvExports()
+    pushState()
+    if (platform.mode === 'guild' && platform.activeChannelId) {
+      send({ type: 'composer-focus-channel', channelId: platform.activeChannelId })
+    }
+    return true
+  }
+  if (t === 'push-sticker-pack-export-csv') {
+    await platform.pushStickerPackExportToMesh()
+    pushState()
+    if (platform.mode === 'guild' && platform.activeChannelId) {
+      send({ type: 'composer-focus-channel', channelId: platform.activeChannelId })
+    }
+    return true
+  }
   if (t === 'push-effective-permission-export-csv') {
     await platform.pushEffectivePermissionExportToMesh()
     pushState()