feat(phase698): role override CSV and effective permission export mesh parity (v0.8.673)

Add signed channel permission overwrite CSV mesh (RPC 114) and effective
permission export (RPC 115) with permission-csv UI, platform mixin, delivery
receipts, ui-flow IPC, agentctl journeys, and test:ci-phase698 regression bundle.

index.js

@@ -2700,6 +2700,45 @@ async function dispatchUiMessage (platform, msg, hooks = {}) {
     }
     return true
   }
+  if (t === 'permission-csv-modal-open') {
+    pushState()
+    send({ type: 'permission-csv-modal-opened' })
+    return true
+  }
+  if (t === 'sync-role-override-csv') {
+    const out = await platform.pushRoleOverrideCsvToMesh()
+    pushState()
+    send({ type: 'role-override-csv-synced', ...out })
+    if (platform.mode === 'guild' && platform.activeChannelId) {
+      send({
+        type: 'composer-focus-channel',
+        channelId: platform.activeChannelId
+      })
+    }
+    return true
+  }
+  if (t === 'clear-role-override-csv') {
+    await platform.clearRoleOverrideCsvExports()
+    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()
+    if (platform.mode === 'guild' && platform.activeChannelId) {
+      send({
+        type: 'composer-focus-channel',
+        channelId: platform.activeChannelId
+      })
+    }
+    return true
+  }
   if (t === 'push-vanity-url-export-csv') {
     await platform.pushVanityUrlExportToMesh()
     pushState()