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/app/interfaces.ts

@@ -41,10 +41,10 @@ export interface SelectionApi {
   captureScrolledRows: (firstRow: number, lastRow: number, side: 'above' | 'below') => void
   clearSelection: () => void
   copySelection: () => Promise<string>
-  copySelectionNoClear: () => Promise<string>
-  getState: () => unknown
-  version: () => number
-  shiftAnchor: (dRow: number, minRow: number, maxRow: number) => void
+  copySelectionNoClear: () => Promise<string>;
+  getState: () => unknown;
+  version: () => number;
+  shiftAnchor: (dRow: number, minRow: number, maxRow: number) => void;
   shiftSelection: (dRow: number, minRow: number, maxRow: number) => void
 }
 

ui-tui/src/app/slash/commands/core.ts

@@ -437,6 +437,39 @@ export const coreCommands: SlashCommand[] = [
     }
   },
 
+  {
+    help: 'save the current transcript to JSON',
+    name: 'save',
+    run: (_arg, ctx) => {
+      const hasConversation = ctx.local
+        .getHistoryItems()
+        .some(m => m.role === 'user' || m.role === 'assistant' || m.role === 'tool')
+
+      if (!hasConversation) {
+        return ctx.transcript.sys('no conversation yet')
+      }
+
+      if (!ctx.sid) {
+        return ctx.transcript.sys('no active session — nothing to save')
+      }
+
+      ctx.gateway
+        .rpc<SessionSaveResponse>('session.save', { session_id: ctx.sid })
+        .then(
+          ctx.guarded<SessionSaveResponse>(r => {
+            const file = r?.file
+
+            if (file) {
+              ctx.transcript.sys(`conversation saved to: ${file}`)
+            } else {
+              ctx.transcript.sys('failed to save')
+            }
+          })
+        )
+        .catch(ctx.guardedErr)
+    }
+  },
+
   {
     aliases: ['sb'],
     help: 'status bar position (on|off|top|bottom)',