Doctor operation.NSchemaApplication.Doctor(DoctorArguments) runs read-only health checks against the configured infrastructure.
IStateLock.Peek. Reads the held lock (or null when free) without acquiring it, so a diagnostic never contends with a real operation. Added
as a default interface method (returns null), so existing implementers are source-compatible.
Force-unlock by id.ForceUnlockArguments.ExpectedLockId makes ForceUnlock a compare-and-swap: refused with a StateLockMismatchException
unless it matches the held lock. Unset keeps the previous “remove whatever is held” behavior.
