codex: preserve buffered subagent thread labels

[VOIDXAI]

Summary

• replay buffered thread lifecycle notifications before turn-scoped filtering
• keep early thread/started / thread/name/updated events from being dropped
• preserve subagent labels in logs and progress output

Why

Closes #31.

If a subagent thread is announced before the main turn ID is known, the buffered lifecycle event can be discarded during replay. That leaves the runtime without the label and logs fall back to raw thread IDs like thr_2.

Validation

• manually reproduced the subagent flow with the fake Codex fixture
• verified the job log now records design-challenger instead of falling back to thr_2

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Scope buffered lifecycle replay to active turn threads

Replaying every buffered thread/started and thread/name/updated notification unconditionally can pull unrelated threads into this capture when delayed notifications from another turn are present in the buffer (for example, while review/start or turn/start is still awaiting its response). Once registerThread adds that thread, later buffered item/* notifications from it pass belongsToTurn because trackedTurnId is still null, so this turn can incorrectly absorb foreign file changes, command executions, or reasoning/log output.

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[VOIDXAI]

Addressed in 09b2105. Instead of replaying unknown lifecycle notifications immediately, the turn capture now defers thread/started / thread/name/updated until the current turn has explicitly registered that thread. That keeps the early subagent label available once the collaboration item arrives, but foreign buffered threads stay out of the capture. I also added tests/codex-buffered-subagent.test.mjs, which buffers both a real subagent lifecycle event and an unrelated off-turn thread message to lock down this edge case.

[dkundel-openai]

Duplicate of #581.