Frame assembly, the assembly set, reassembly, expired-frame feedback and
their tests were kept here after the September dead-code cut as the seed
for Ratatoskr's reassembly. That seed has been planted (Ratatoskr
2618184, crates/ratatoskr-core/src/video.rs), so the producer stops
carrying code only a consumer runs. 705 lines. What stays is the producer
half: packetize, XOR stripe parity, and build_receiver_feedback, which the
sender's repair-cache tests use to construct what a receiver would say.
Also removes adts_frame, a test helper orphaned by the AAC cut.
cargo test -p muninn-daemon -> 151 passed, no warnings
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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