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## Why Thread names are app-server metadata now, backed by the thread store and sqlite state database. Keeping a core `SetThreadName` op plus a rollout `thread_name_updated` event made rename persistence live in the wrong layer and required historical replay support for an event that new app-server flows should not write. ## What changed - Removed `Op::SetThreadName` and `EventMsg::ThreadNameUpdated` from the core protocol and deleted the core handler path that appended rename events to rollouts. - Updated app-server `thread/name/set` so both loaded and unloaded threads write through thread-store metadata and app-server emits `thread/name/updated` notifications. - Updated local thread-store name metadata updates to write sqlite title metadata and the legacy thread-name index without appending rollout events. - Removed state extraction and rollout handling for the deleted thread-name event. ## Validation - `cargo test -p codex-app-server thread_name_updated_broadcasts` - `cargo test -p codex-app-server thread_name_set_is_reflected_in_read_list_and_resume` - `cargo test -p codex-thread-store update_thread_metadata_sets_name_on_active_rollout_and_indexes_name` - `cargo test -p codex-state` - `cargo check -p codex-mcp-server -p codex-rollout-trace` - `just fix -p codex-app-server -p codex-thread-store -p codex-state -p codex-mcp-server -p codex-rollout-trace` ## Docs No external documentation update is expected for this internal ownership change.