test(subagent): align inherited result event reference

apps/cli/tests/profiles/headless/tests/expected/subagent-inheritance/parent.expected.jsonl

@@ -25,7 +25,7 @@
 {"type":"tool/call","data":{"turn":2,"step":1,"callId":"delegate-write","name":"subagent","arguments":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}}
 {"type":"subagent/catalog","data":{"version":0,"childId":"{{sessionId}}","childCreatedAt":0,"mode":"continuable","label":"Delegated write probe"}}
 {"type":"agent/inbox/spliced","data":{"target":"next-step","start":0,"inserted":[{"content":[{"type":"text","text":"Background subagent {{sessionId}} finished and will do no further work unless you send it more."}],"source":{"kind":"subagent-settled","form":"notice","summary":"Background subagent {{sessionId}} finished and will do no further work unless you send it more.","senderSessionId":"{{sessionId}}"},"role":"user","id":"{{sessionId}}"}]}}
-{"type":"tool/result","data":{"turn":2,"step":1,"message":{"role":"tool","source":{"kind":"tool","callId":"delegate-write"},"toolCallId":"delegate-write","content":[{"type":"text","text":"started subagent {{sessionId}}"}],"isError":false,"id":"{{sessionId}}"}},"sourceEventSeqs":[22],"surfaceOp":"append"}
+{"type":"tool/result","data":{"turn":2,"step":1,"message":{"role":"tool","source":{"kind":"tool","callId":"delegate-write"},"toolCallId":"delegate-write","content":[{"type":"text","text":"started subagent {{sessionId}}"}],"isError":false,"id":"{{sessionId}}"}},"sourceEventSeqs":[23],"surfaceOp":"append"}
 {"type":"step/end","data":{"turn":2,"step":1}}
 {"type":"agent/inbox/spliced","data":{"target":"next-step","start":0,"removedCount":1,"inserted":[]}}
 {"type":"step/start","data":{"turn":2,"step":2}}