Harden mux + decrypt paths; fail-loud on unresolvable keys

mp4 demuxer (untrusted input): bound every allocation sized from a box
field (stsz/stco/stsc counts, stts/ctts run-lengths, per-sample and moov
sizes, plus an absolute cap so a sparse file can't inflate file_len);
guard the parse_stsd slice and a zero mdhd timescale; cap track count so
the per-track PID can't overflow; rewrite read_moov to handle size==0 /
size<8 / 64-bit largesize; parse esds/AudioSpecificConfig for AAC; write
tkhd duration in the movie timescale.

decrypt: resolve_mux_key_map now fails loud on an extent no key can
classify instead of inheriting the previous extent's key, so a keymap
never silently carries a wrong key; the sweep/patch key-fetch recovery
fails loud when a unit is still unresolved after the retry.

AACS: reject inverted forensic segments in both range builders; compare
the forensic index in u16 space so an out-of-range value can't truncate
onto a valid u8 index. RECOVERED_ERROR no longer latches the damage zone,
preserving the 30s wedge cooldown for a following hard error.

audio: AAC/MP2/MP3/FLAC carry the last PTS across a PES with no timestamp;
the DTS-HD extension-sync search is bounded to after the core; the MP4
16.16 sample-rate field saturates. demux_sink records the video reference
before the kind filter so audio:// / sub:// keep multi-clip PTS continuity
and the DELAY tag.

Remove a dead error variant and the AACS-unsupported-video code; codec
comments cite the primary format specs; assorted doc/naming fixes and
regression tests throughout.

src/scsi/linux.rs

@@ -8,8 +8,9 @@
 //! when `hdr.timeout` expires, and by the time the ioctl returns the
 //! kernel has already done what it can.
 //!
-//! This matches what every reference project does: MakeMKV (8 s sync
-//! ioctl), sg_dd (60 s sync ioctl), the kernel default for SCSI block
+//! This matches established practice for optical/SCSI I/O: a single
+//! synchronous ioctl with a bounded per-command timeout (commonly in the
+//! 8–60 s range), consistent with the Linux kernel default for SCSI block
 //! devices (30 s `/sys/.../timeout`).
 //!
 //! Pre-0.13.20 we ran an async `write() + poll(1.5s) + close-on-timeout +