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c3d49d70f9
Subagent sessions emitted chat and agent broadcast events with only sessionKey. Clients had to follow up with sessions.subscribe to learn the parent, creating a timing race. Inject spawnedBy at the six previously uncovered broadcast sites (emitChatDelta, flushBufferedChatDeltaIfNeeded, emitChatFinal done + error, seq gap error, non-tool agent event). resolveSpawnedBy reads from the session store directly. It short-circuits for session keys that cannot carry lineage (mirrors supportsSpawnLineage in sessions-patch.ts), so the hot chat delta path does not touch the store for normal sessions. No cache: spawnedBy is immutable once set, and the only frequent caller is the subagent/acp hot path which is already filtered by the lineage key check. Signed-off-by: samzong <samzong.lu@gmail.com>