cultmesh-quic-peer.ts serve opens a CultMeshQuicRealtimeProvider on the same
test fixture credential the unit tests use, prints {status, endpoint} in the
shape spawnServeProcess already expects, waits for a first peer before
broadcasting (a provider's broadcast to zero peers silently sends nothing,
same reasoning as the C# quic-realtime-serve peer's
WaitForFirstConnectionAsync), then broadcasts --frames frames at --delivery
with --interval-ms between them, stopping early on stdin EOF like the C#
peer's WatchStdinCloseAsync.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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