Lite-03 audit L3: completes the subscriber-side Probe surface to
mirror kixelated's `Subscriber::run_probe_stream`
(`rs/moq-lite/src/lite/subscriber.rs`).
`MoqLiteSession.probe()` opens a bidi, writes
`ControlType::Probe` (varint 4), and returns a `MoqLiteProbeHandle`
whose `updates` flow yields each size-prefixed `MoqLiteProbe`
message the publisher pushes. The handle's `close()` FINs the
bidi and cancels the pump.
`updates` is a `MutableSharedFlow(replay=8)` so a collector that
attaches after the publisher's first emit doesn't miss it
(matches the same shape the announce-watch uses).
No production consumer for the API today — Amethyst's nests
listener doesn't run ABR on a fixed-rate Opus encoder. The API
exists to round out the moq-lite Lite-03 surface: a diagnostic
tool can now read a publisher's bitrate without subscribing to
its data track.
The publisher-side handler (existing) was already correct: it
writes one `MoqLiteProbe` (32 kbps Opus voice hint) and FINs.
Regression test:
`MoqLiteSessionTest.subscriber_probe_writes_control_type_and_decodes_publisher_bitrate`.
Audit doc: nestsClient/plans/2026-05-09-moq-lite-rfc-compliance.md (L3).
https://claude.ai/code/session_012TGfo99Ugz7fcCPv85a8Tq
Claude
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