Summary

• add a scoped level_id to ExtensionData and expose it through level_id()
• remove thread_id/turn_id parameters from extension contributor inputs where the scoped ExtensionData already carries that identity
• move turn-scoped extension data onto TurnContext so token usage and lifecycle contributors can share the same turn store

Testing

• cargo check -p codex-extension-api -p codex-core --tests
• cargo test -p codex-extension-api
• cargo test -p codex-guardian
• cargo test -p codex-core --lib record_token_usage_info_notifies_extension_contributors
• cargo test -p codex-core --lib submission_loop_channel_close_emits_thread_stop_lifecycle
• cargo test -p codex-core --lib submission_loop_channel_close_aborts_active_turn_before_thread_stop_lifecycle
• just fix -p codex-extension-api
• just fix -p codex-guardian
• just fix -p codex-core
• just fmt

Note

• Attempted cargo test -p codex-core; it aborted in agent::control::tests::spawn_agent_fork_last_n_turns_keeps_only_recent_turns with the existing stack overflow before the full suite completed.