nwc: confirm 13194 info-event publish so it cannot be silently dropped

publishInfo sent the kind-13194 info event over the long-lived NWC socket
fire-and-forget. The nostr lib Relay.send is async (await wait_connected; ws.send)
but was called without await, and success was logged immediately. A send that
rejected (e.g. ws in CLOSING state during a strfry reconnect) was silently
dropped while the log claimed success, leaving NWC clients with "no info event"
until a manual republish.

Publish over a fresh short-lived socket and wait for the relay OK, retrying up to
3x with honest logging (warn on unconfirmed, err on give-up). ensureInfos
receive-based detection is unchanged. Verified on prod: deleted both info events,
restarted, both republished within seconds.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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