test(snapshot): cover minimum child turn waits

packages/support/acp-snapshot/tests/harness.spec.ts

@@ -826,6 +826,16 @@ describe('runScenario', () => {
       { agent: AGENT, mode: 'replay', fixtureFile: closed.fixtureFile },
     )
     expect(result.sessionLogs[1]?.parentSession).toBe(result.sessionId)
+    await expect(runScenario(
+      {
+        steps: [
+          ...boot,
+          { op: 'promptAndCancel', text: 'hang' },
+          { op: 'waitForSubagentTurnEnd', minimumTurn: 2, timeoutMs: 20 },
+        ],
+      },
+      { agent: AGENT, mode: 'replay', fixtureFile: closed.fixtureFile },
+    )).rejects.toThrow(/subagent child #1 did not persist closed turn 2 within 20ms/)
 
     const seedOnly = await scenario({
       prompt: 'hang-until-cancel',
@@ -859,13 +869,13 @@ describe('runScenario', () => {
         ],
       },
       { agent: AGENT, mode: 'replay', fixtureFile: seedOnly.fixtureFile },
-    )).rejects.toThrow(/subagent child #1 did not persist a closed work turn within 20ms/)
+    )).rejects.toThrow(/subagent child #1 did not persist closed turn 1 within 20ms/)
 
     const missing = await scenario({})
     await expect(runScenario(
       { steps: [...boot, { op: 'waitForSubagentTurnEnd', child: 2, timeoutMs: 20 }] },
       { agent: AGENT, mode: 'replay', fixtureFile: missing.fixtureFile },
-    )).rejects.toThrow(/subagent child #2 did not persist a closed work turn within 20ms/)
+    )).rejects.toThrow(/subagent child #2 did not persist closed turn 1 within 20ms/)
   })
 
   it('waitForTitleAfterTurnEnd times out when the title precedes the boundary', { timeout: 20_000 }, async () => {