hddvd: authoritative title composition from the Advanced-Content playlist

Parse ADV_OBJ/VPLST000.XPL (the real HD-DVD player playlist) with roxmltree
into one DiscTitle per <Title>: its PrimaryAudioVideoClip clips in order (EVO
via the .MAP sidecar), the titleDuration, the displayName, and the ChapterList.
A layer-break split (FEATURE_1+FEATURE_2, feature/feature_Divide) composes into
ONE title with the two parts as clips, each carrying its title-time in/out
points (45kHz ticks) for seamless-join splicing. Falls back to the clip-name
heuristic when no playlist is present.

Fixes unknown runtimes (real durations), poor names (FEATURE -> 'Main Movie'),
and gives authoritative composition + chapters. Validated on ANCHORMAN (97m),
SHAUN (99m), HARRY_POTTER (152m).

Cargo.toml

@@ -36,6 +36,12 @@ rand = "0.8"
 cmac = "0.7"
 zip = { version = "2", default-features = false, features = ["deflate"] }
 base64 = "0.22.1"
+# Read-only XML DOM parser (pure Rust, forbid(unsafe_code), entity-expansion
+# bounded). Parses the HD-DVD Advanced-Content playlist `ADV_OBJ/VPLST000.XPL`
+# — untrusted disc bytes — into authoritative titles/clips/chapters. A real
+# parser, not a hand-rolled scanner: the XPL is genuine XML (comments, varied
+# attribute order, self-closing tags).
+roxmltree = "0.20"
 # Trace-level instrumentation for Disc::copy + SgIoTransport::execute. Permitted
 # under CLAUDE.md ("Acceptable strings: debug/trace logging"). Consumers (autorip)
 # wire a tracing subscriber and pipe events into the JSONL debug log.