h-verify

Verifies that a recorded DecisionRecord still holds — baseline-vs-measure evidence loop with drift detection per FPF Evidence Decay. Make sure to use this skill whenever the user asks "did dec-X work", "is decision Y still valid", "did the prediction come true", "check if the migration held", "is X stale", "measure that decision against reality", "did we actually fix Z", "is our caching decision still right" — or whenever a shipped decision needs a post-implementation reality-check before further work relies on it. Also use when /h-status surfaces a refresh-due decision. NOT for ad-hoc sanity checks (just run the tests directly). NOT for re-framing the underlying problem (use h-frame).