pg83

Manual trigger only — invoke when the user explicitly asks (e.g. `/std-design`, "design this in std style", "apply the std philosophy"). Encodes the arena-first design philosophy from README.md: a single ObjPool owns every object in a logical unit of work, headers traffic only in interface pointers, implementations live in anonymous namespaces inside `.cpp`, and lifetime is bulk — not per-object. Use this when shaping a new subsystem, choosing data structures, deciding header vs. implementation split, or reviewing existing code for fit with the philosophy. Do NOT auto-invoke from file content alone.