Whether a memory may be used for a given capability right now. Combines
the per-trace policy flag with the requiresReverificationAfterMs
staleness check (using provenance.lastVerifiedAt as the anchor and
falling back to provenance.sourceTimestamp when never re-verified).
Pass now for deterministic testing; defaults to Date.now().
Whether a memory may be used for a given capability right now. Combines the per-trace
policyflag with therequiresReverificationAfterMsstaleness check (usingprovenance.lastVerifiedAtas the anchor and falling back toprovenance.sourceTimestampwhen never re-verified).Pass
nowfor deterministic testing; defaults toDate.now().