Closes the transfer.nim TODO: received transfer messages pass through an
injected validator before syncMessageIngress; rejects are dropped and
counted (total_transfer_messages_rejected). mountStoreSync wires a
nil-guarded closure that runs Rln.validateMessage with the new
checkFreshness=false switch - synced messages are old by design, so the
timestamp-recency bound is skipped while proof, membership root and
timestamp/epoch binding still verify. Known gap: proofs against roots
older than the acceptable root window are rejected, bounding history
sync across heavy membership churn.
Part of the "Store as a startup-only dependency" experiment (step 8).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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