feat: add state replicator crate on top of the engine - #25
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This was referenced Jul 13, 2026
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What changed
Added authenticated state replication over the engine, including a leader-side
TCP dispatcher, follower client, versioned protocol, snapshot fallback, and
full-stack replication coverage.
Why
Authorized followers need to resume from an exact durable cursor, catch up
without duplicate application, and recover from a snapshot when the requested
stream is no longer retained.
Closes #27.
Impact
allowlist and clients verify the canonical engine authority.
distinct-key followers are terminal.
accountsdb snapshot after validating the requested cursor.
boundaries flow through the external pacer to preserve ordering.
Reviewer notes
The security boundary is the canonical signer plus follower allowlist. The
durability boundary requires a follower to flush before every handshake and to
flush its cursor before dumping volatile state during shutdown.
Follow-up
Transport encryption, key rotation, and dynamic allowlist management remain
outside this change.