fix(plan): make direct exit discoverable

packages/ui/tui/src/index.ts

@@ -2384,6 +2384,7 @@ export function createTuiChat(
         ...ctx.commands.list(agent).map(command => ({
           name: command.name,
           description: command.description,
+          ...(command.input === undefined ? {} : { argumentHint: command.input.hint }),
         })),
         ...skillCommands,
       ],

packages/ui/tui/tests/tui.spec.ts

@@ -1706,6 +1706,11 @@ describe('pi-tui chat lifecycle and transcript', () => {
       handler: () => ({ kind: 'error' as const, text: 'plugin error result' }),
     })
 
+    result.terminal.send('/plugin-ch')
+    await tick()
+    expect(result.terminal.output).toContain('<value> — Run a plugin command')
+    result.terminal.send('\x03')
+
     result.terminal.send('/plugin-check  value  ')
     result.terminal.send('\r')
     await tick()