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# Why `notify` is the remaining compatibility surface from the legacy hook implementation. The newer lifecycle hook engine now owns the active hook system, so we should start steering users away from adding new `notify` configs before removing the old path entirely. This also adds a lightweight watchpoint for the deprecation so we can see how much legacy usage remains before the clean drop. # What - emit a startup deprecation notice when a non-empty `notify` command is configured - emit `codex.notify.configured` when a session starts with legacy `notify` configured - emit `codex.notify.run` when the legacy notify path fires after a completed turn - mark `notify` as deprecated in the config schema and repo docs - remove the orphaned `codex-rs/hooks/src/user_notification.rs` file that is no longer compiled - add regression coverage for the new deprecation notice # Next steps A follow-up PR can remove the legacy notify path entirely once we are ready for the clean drop. Before then, we can watch `codex.notify.configured` and `codex.notify.run` to understand the deprecation impact and remaining active usage. The cleanup PR should then delete the `notify` config field, the `legacy_notify` implementation, the old compatibility dispatch types and callsites that only exist for the legacy path, and the remaining compatibility docs/tests. # Testing - `cargo test -p codex-hooks` - `cargo test -p codex-config` - `cargo test -p codex-core emits_deprecation_notice_for_notify`