* docs(agents): standardize canonical record guards
* refactor(model-catalog): use canonical record guard
* refactor(scripts): use canonical record guard
* refactor(ui): use canonical record guard
* refactor(codex): use canonical record guard
* refactor(agents): use canonical record guard
* refactor(sessions): use canonical record guard
* refactor(doctor): use canonical record guard
* refactor(infra): use canonical record guard