refactor(agent): trim obsolete loop surfaces

packages/ui/tui/tests/harness.ts

@@ -23,6 +23,7 @@ interface FakeAgent extends Agent {
   sent: ContentBlock[][]
   sentOptions: (SendOptions | AliasSendOptions | undefined)[]
   steered: ContentBlock[][]
+  steeredIds: AgentMessageId[]
   steeredOptions: (AliasSendOptions | undefined)[]
   injected: ContentBlock[][]
   injectedOptions: (AliasSendOptions | undefined)[]
@@ -161,6 +162,7 @@ export async function createTuiTestHarness<TerminalType extends Terminal, Exit e
   options.beforeMount?.(session)
   const sent: ContentBlock[][] = []
   const steered: ContentBlock[][] = []
+  const steeredIds: AgentMessageId[] = []
   const sentOptions: (SendOptions | AliasSendOptions | undefined)[] = []
   const steeredOptions: (AliasSendOptions | undefined)[] = []
   const injected: ContentBlock[][] = []
@@ -175,6 +177,7 @@ export async function createTuiTestHarness<TerminalType extends Terminal, Exit e
     sent,
     sentOptions,
     steered,
+    steeredIds,
     steeredOptions,
     injected,
     injectedOptions,
@@ -192,7 +195,9 @@ export async function createTuiTestHarness<TerminalType extends Terminal, Exit e
     steer(content, options) {
       steered.push(content)
       steeredOptions.push(options)
-      return AgentMessageId('stub')
+      const id = AgentMessageId(`steering-${steeredIds.length + 1}`)
+      steeredIds.push(id)
+      return id
     },
     inject(content, options) {
       injected.push(content)

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

@@ -1363,6 +1363,14 @@ describe('pi-tui chat lifecycle and transcript', () => {
       result.terminal.send('\r')
     }
     const drainSteering = (text: string): void => {
+      const id = result.agent.steeredIds.shift()
+      if (id !== undefined) {
+        result.ctx.emit('agent/inbox/dequeue', result.agent, {
+          id,
+          content: [{ type: 'text', text }],
+          source: { kind: 'user' },
+        })
+      }
       result.session.append('steering/message', { turn: 1, content: [{ type: 'text', text }], source: { kind: 'user' } }, { surfaceOp: 'append' })
     }
 
@@ -1401,9 +1409,8 @@ describe('pi-tui chat lifecycle and transcript', () => {
     await tick()
     expect(result.terminal.output).toContain('1 queued')
 
-    // A steering/message whose source matches no pending badge entry (here a
-    // plugin source with no tracked enqueue) pops nothing, so it cannot consume
-    // a pending user slot even when it drains first.
+    // A steering/message has no inbox identity and therefore cannot consume a
+    // pending slot by itself.
     result.terminal.output = ''
     result.session.append('steering/message', {
       turn: 1,