This PR depends on [#31296](https://github.com/openai/codex/pull/31296) for the canonical-to-legacy event mappings. ## Description This PR makes the v1 and v2 wait paths emit canonical `TurnItem::CollabAgentToolCall` lifecycle instead of `CollabWaitingBegin` / `CollabWaitingEnd` directly. Both paths already used the same legacy waiting events before this PR. The v1 item carries receiver metadata and final agent statuses for its target agents; v2 waits for mailbox activity rather than specific agents, so it keeps those fields empty, matching the existing v2 legacy payload. App-server v2 consumes the canonical item directly and ignores the mapped legacy wait events. ## Why Wait is separate from the other collab tools because it is multi-target and has distinct timeout/status behavior. Keeping it last also lets this PR remove the old helper that only existed to shape legacy wait status entries in core. ## What changed - Emit canonical collab wait items from both v1 and v2 wait handlers. - Preserve receiver metadata and agent status snapshots on completed wait items. - Remove the old core helper for building legacy wait status entries. ## Follow-up The next stack PR, [#30188](https://github.com/openai/codex/pull/30188), writes canonical `TurnItem` values to paginated rollout files.
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