feat(irc): add interactive setup

feat(gateway): refine Platform._missing_ and platform-connected dispatch

Restricts plugin-name acceptance to bundled plugin scan + registry
(no arbitrary string -> enum-pollution), pulls per-platform connectivity
checks into a _PLATFORM_CONNECTED_CHECKERS lambda map with a clean
_is_platform_connected method, and adds tests covering the checker map,
plugin platform interface, and IRC setup wizard.

ui-tui/src/types/hermes-ink.d.ts

@@ -59,6 +59,32 @@ declare module '@hermes/ink' {
     }>
   }
 
+  export type FrameEvent = {
+    readonly durationMs: number
+    readonly phases?: {
+      readonly renderer: number
+      readonly diff: number
+      readonly optimize: number
+      readonly write: number
+      readonly patches: number
+      readonly optimizedPatches: number
+      readonly writeBytes: number
+      readonly backpressure: boolean
+      readonly prevFrameDrainMs: number
+      readonly yoga: number
+      readonly commit: number
+      readonly yogaVisited: number
+      readonly yogaMeasured: number
+      readonly yogaCacheHits: number
+      readonly yogaLive: number
+    }
+    readonly flickers: ReadonlyArray<{
+      readonly desiredHeight: number
+      readonly availableHeight: number
+      readonly reason: 'resize' | 'offscreen' | 'clear'
+    }>
+  }
+
   export type RenderOptions = {
     readonly stdin?: NodeJS.ReadStream
     readonly stdout?: NodeJS.WriteStream