Use when the user states how they work - "always X", "never Y", "from now on", "stop doing", "I prefer", "in this repo nobody", "we don't" - or asks what rules apply here, why a preference was forgotten between chats, or how a teammate gets the same conventions. Also at session start, to load the standing rules. NOT for a one-off instruction about the task in hand, NOT for ticket status (`tickets-zordon`), NOT for host settings or hooks (`update-config`).
