go/moq: wrapper catch-up (stats, hops, TLS options, media-on-track)

[kixelated]

The hand-written Go wrapper (go/wrapper/moq) lags the generated moq-ffi surface more than the other wrappers. Missing today:

• Session.Stats() (connection stats snapshot; py/swift/kt have it)
• Announcement.Hops()
• Client TLS options: roots, system roots, certificate fingerprints (only WithTLSDisableVerify/WithBind exist in go/wrapper/moq/client.go)
• PublishMediaOnTrack and MoqVideoHint support
• Datagrams / subscription update / track info once those land in moq-ffi (see their issues)

Also, from the #2142 review: FetchGroup should take a ctx like RecvGroup/RequestedGroup (via runCancellable) so a fetch that misses the cache can be cancelled; that may need a cancel handle on the ffi fetch object.

All additive. Update doc/lib/go alongside per the Cross-Package Sync table.

(Written by Claude Fable 5)

[coderabbitai]

🔗 Related PRs

#571 - Improve the WebTransport/WebSocket options you can pass. [closed]
#645 - Add more compatibility for draft 14 [closed]
#931 - docs: native client integration guide [closed]
#943 - Reduce the moq-lite API size [closed]
#1075 - Enable draft-17 ALPN for moq-transport interop [closed]
#1135 - Rename next_group to recv_group for clarity [closed]
#1963 - feat(moq-net): hook up the rest of moq-lite-05 wire (TRACK_INFO, SUBSCRIBE_END, frame timestamps) [merged]
#2106 - feat(moq-net,js/net): add moq-transport draft-19 (moqt-19) [merged]

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