fix(feedback): keep payload in feedback event

packages/client/runtime/tests/event-script.ts

@@ -67,6 +67,8 @@ export const ev = {
     at(seq, { type: 'turn/end', data: { turn, reason: { kind: reason } } }),
   commandRun: (seq: number, commandId: string, name: string, args = ''): SessionEvent =>
     at(seq, { type: 'command/run', data: { commandId, name, args, source: { kind: 'user' } } }),
+  commandRunWithoutInput: (seq: number, commandId: string, name: string): SessionEvent =>
+    at(seq, { type: 'command/run', data: { commandId, name, source: { kind: 'user' } } }),
   commandDone: (seq: number, commandId: string, kind: 'success' | 'error' = 'success', text?: string): SessionEvent =>
     at(seq, { type: 'command/done', data: { commandId, kind, ...text === undefined ? {} : { text } } }),
 }

packages/client/runtime/tests/fold-adapter.spec.ts

@@ -195,6 +195,14 @@ describe('FoldAdapter', () => {
       })
     })
 
+    it('represents command input omitted by the host as null', () => {
+      const adapter = new FoldAdapter()
+      adapter.reset([ev.commandRunWithoutInput(0, 'cmd-private', 'feedback')], 0)
+      expect(adapter.nodes().nodes[0]).toMatchObject({
+        kind: 'command', name: 'feedback', args: null, outcome: null,
+      })
+    })
+
     it('soft-falls a done-only window into a node built from the done (cross-window cut)', () => {
       const adapter = new FoldAdapter()
       adapter.reset([ev.commandDone(80, 'cmd-3', 'error', '失败了')], 80)