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## Why This PR https://github.com/openai/codex/pull/24161#discussion_r3325692763 revealed a subagent data modeling issue, where we overloaded `forked_from_id` to also mean `parent_thread_id`. That's incorrect since guardian and review subagents can be a subagent and NOT fork the main thread's history. The solution here is to explicitly store a new `parent_thread_id` on `SessionMeta`, alongside `forked_from_id` which already exists. While we're at it, also expose it in the app-server protocol on the `Thread` object. A thread->subagent relationship and a fork of thread history are orthogonal concepts. ## What Changed - Added top-level `parent_thread_id` persistence on `SessionMeta` and runtime/session plumbing through `SessionConfiguredEvent`, `CodexSpawnArgs`, `SessionConfiguration`, `ThreadConfigSnapshot`, `TurnContext`, and `ModelClient`. - Made turn metadata, request headers, analytics, and subagent-start events read the separate runtime/top-level parent field instead of deriving general parent lineage from `SessionSource` or `forked_from_thread_id`. - Passed parent lineage separately at delegated subagent, review, guardian, agent-job, and multi-agent spawn construction sites; copied-history fork lineage remains derived only from `InitialHistory`. - Persisted and exposed parent lineage through rollout/thread-store projections and app-server v2 `Thread.parentThreadId`. - Updated app-server README text and regenerated app-server schema fixtures for the additive `parentThreadId` response field.