Nodes running store sync standalone carry an archive but no store
protocol; GET /store/v3/messages without peerAddr now falls back to the
local archive (new queryArchive, same conversion path as mountStore's
request handler so pagination semantics match). Only the archive's
retention window is served; peerAddr still queries remote stores. This
is the audit interface the simulator's delivery verifier uses.
Part of the "Store as a startup-only dependency" experiment (step 3).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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