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## Why We recently added `forked_from_thread_id` which lets us trace where a thread's _context_ comes from, but we also want to understand subagent lineage (e.g. which parent thread spawned this subagent? what kind of subagent is it?) which is orthogonal. This PR adds `parent_thread_id` and `subagent_kind` to the `x-codex-turn-metadata` header sent to ResponsesAPI. ## What changed - Adds `parent_thread_id` and `subagent_kind` to core-owned `x-codex-turn-metadata`. - Restores persisted `SessionSource` and `ThreadSource` from resumed session metadata so cold-resumed subagent threads keep their lineage on later Responses API requests. - Centralizes parent-thread extraction on `SessionSource` / `SubAgentSource` and reuses it in the Responses client, analytics, agent control, and state parsing paths. - Extends reserved-key, git-enrichment, thread-spawn, and app-server v2 metadata coverage for the new lineage fields. ## Verification - Not run locally per request. - Added focused coverage in `core/src/turn_metadata_tests.rs` and `app-server/tests/suite/v2/client_metadata.rs`.