New messaging option send-confirmation = store (default) | propagation.
In propagation mode MessageSent fires from the publish path (relay mesh
/ lightpush relayPeerCount) right after MessagePropagated, with no store
polling; finalized tasks no longer re-enter the task cache, so the
confirmation is emitted exactly once. Store mode is bit-identical to
before. The option flows through both the structured and legacy flat
JSON config shapes.
Part of the "Store as a startup-only dependency" experiment (step 9).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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