Deterministic coverage for the quota-aware lane: threshold boundaries
(14.9/15/15.1), both-below preference, fetch-failure fail-open, cooldown
elapsed-vs-not hysteresis, quota-reset recovery (never for auth),
explicit fail-closed in both directions, bounded double-failure block,
failure-reason classification, metrics emission, and worker env key
stripping. Based on PR #15 (fix/hermes-result-decomposition-reliability).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
