Router skill predicate gap

Problem

A skill is documented as MANDATORY and wired into a UserPromptSubmit router hook, so the rule looks enforced rather than remembered. It is not: the hook runs, exits 0, and matches nothing, because its regex list omits the word users most often type for the thing it guards. The wiring is present, the hook is healthy, the config is valid — and nothing distinguishes "the predicate did not match" from "no prompt needed it."

Use when

• A rule file says a skill is MANDATORY, and you cannot recall the reminder arriving.
• You are about to write, or repeat, the claim that a discipline is hook-enforced.
• A rule's patterns list was seeded from error signatures or example phrasings and never re-read.
• The skill did fire once, and you have not checked which pattern matched.

Root cause