feat(pm): reconcile the gate families a dev DERIVED against the ones it RAN (#14306)

Add a --ran <file> verdict mode to scripts/pm/dispatch-gates.mjs. It takes a
run record whose lines are the exact strings --commands emits and reports an
exact set difference against this tree's derivation, recomputed in the same
process.


Claude-Session: https://claude.ai/code/session_01WLJQhde67SeTccsmnBVarV

Co-authored-by: Claude <trymqms@gmail.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: 3 people