The [HiCache-write]/[HiCache-load]/[HiCache-collective] and
[CacheCtrl-write] per-operation logs fired at INFO on the scheduler
thread during serving (every write-through, load-back, ack release,
and rate-limited collective summary), eating into stream gaps.
Demote all 29 to debug; one-time [HiCache-draft] init logs stay INFO
and genuine failures stay WARNING (write_backup CP FAILED after
deterministic retry).
Also repair TestHiCacheEvictLoggingLevels, which asserted markers
that no longer exist in this tree (stale list, failing on the
pristine branch): pin the current hot-path markers as debug-only and
extend the check to cache_controller.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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