Introduce packages/loop as a capability seam covering goal-based (and
naturally proactive) loops around the existing agent-loop, deferring
time-based scheduling to a future dsh-schedule RFC. Four cordis service
seams — loop-as-session, pluggable Evaluator/Budget with EvaluatorSpec
tiers and protectedPaths, RoundHandoff, GoalReflector — plus a driver-
enforced Default-FAIL contract and reuse of packages/fs policy gate for
reward-hacking defense. Bilingual pair.