publishEventToRelay optimistically reports success when a relay handle exposes
no ok/failed event and isn't thenable (legacy 'seen'-only relays). That made an
UNCONFIRMED publish indistinguishable from a real ack, so a note could show
'Published' with nothing actually stored. The result now carries optimistic:true
for that path (callers can distinguish it from a confirmed ack) and logs a
dev.warn. Behavior is otherwise unchanged (still treated as success for legacy
relays). Publish audit #3.
Test: tests/nostr-publish-optimistic.test.mjs.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
