How settings are scoped per-button (stored inside the button blob) and per-role (stored in role-specific options), how the cascade resolves conflicts, and the gotchas around blob-shaped per-button storage.

How button definitions are persisted: serialized arrays in the local-app-button-array* options. Why the option key is frozen, the per-role variants, and the implications for renames or schema changes.

mam_codex_manager — the settings inspection / discovery API. Lets admin tooling enumerate all registered settings, categories, and content-class field schemas without parsing PHP source.

How forms-manager integrates with the third-party Gravity Forms plugin: GF discovery, the cache layer, the per-form-id submission hook chain, and what happens when GF is missing or deactivated.

Per-phase reference for phase_auth, phase_settings, phase_content, phase_finalize. What each does, what each fires, what each reads/writes on the context, and where sibling-plugin hooks land.