Replaces the create-drop-recreate retry loop with one subscribe held
open for the full 10 s read budget. Inner timeouts are gone — we
just await catalog.next() under one outer 10 s timeout.
Why: moq-rs 0.10.x maps Error::Cancel to wire reset code 0
(see moq-lite/src/error.rs). The previous retry shape produced a
cascade:
attempt 0 timeout → drop catalog_track → moq-rs sees track.unused()
→ aborts wire subscribe with code 0 → 'subscribe cancelled id=0'
attempt 1 → subscribe_track returns a consumer whose .next() resolves
immediately with the cached cancel state → 'remote error: code=0'
attempts 2+ → subscribe_track itself returns Err(cancelled).
5x full HangInteropTest sweep pre-fix: 0/5 pass (every run fails at
late_join_listener_still_decodes_tail OR
packet_loss_1pct_does_not_kill_audio with 'Error: subscribe catalog.
cancelled.').
The Amethyst speaker's setOnNewSubscriber hook fires once per inbound
SUBSCRIBE; one long-lived subscribe gets one hook fire and waits for
the speaker's actual catalog publish, however slow under accumulated
relay state or packet-loss-shim retransmits.
Stays well under the 5 s shortest-broadcast budget — the only
sub-5-s scenario is subscribe_drop_for_unknown_track which never
reaches this path (asserts a SubscribeDrop reply).
Claude
8cc7cbd42b