Claude
e484e3b210
Surface moq-lite's `catalog.json` track on the NestsListener API.
The catalog publishes one JSON object per group describing the
broadcast (codec, sample rate, optional speaker-side hints) and
is the canonical channel a watcher reads first to discover
available tracks.
Wire-up:
* NestsListener.subscribeCatalog(pubkey) — interface method with
a default body that throws UnsupportedOperationException, so
the IETF DefaultNestsListener fails loud rather than returning
a flow that never delivers data.
* MoqLiteNestsListener overrides it to wrap
`session.subscribe(broadcast = pubkey, track = "catalog.json")`
through the same MoqObject mapping the audio path uses.
* ReconnectingNestsListener routes both subscribeSpeaker and
subscribeCatalog through a shared `reissuingSubscribe` helper —
catalog handles also survive session swaps via the
MutableSharedFlow re-issuance pump.
Tests:
* NestsListenerCatalogTest — verifies the interface default
rejects with UnsupportedOperationException so a caller wired
against the IETF reference path fails fast.
VM/UI consumers (e.g. "speaker codec" tooltip) are intentionally
out of scope for this commit; this exposes the capability so a
follow-up can plug in a JSON parser + per-pubkey catalog cache.