Tighten FM-Towns image coverage; retire stale ~2% deferral claims #275
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Delete branch "refs/pull/275/head"
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Refs #267 (closed with the investigation summary).
The issue's "~2% undecoded FM-Towns image tail" turned out to be stale documentation: the 80
Y-mark = -32records (80/4,415 ≈ 1.8%) were decoded by the U4towns/C4towns ports long ago, but several ROADMAP/docs passages still called them deferred.tests/fm_towns_jp_archive.rs: the coverage assertion now partitionsiter_image()and asserts 4,415 records with zeroErr— the old ok-count could not distinguish "all Ok" from "more records, some Err".docs/formats/graphics-dat.md,docs/sources/fm-towns-jp-cd.md, and theparse_fm_towns/ crate-level rustdoc drop the stale "deferred" / "open piece" / "~2 %" claims; colour resolution is credited to the landed #260/#265 work and champion portraits to #188. Also repairs a dangling section reference (the colour material lives inpalette-lut.md).No decoder logic changes. Gates:
cargo fmt --all --check,cargo clippy --workspace --tests,cargo test -p dm2-graphics,cargo doc -p dm2-graphics --no-depsall exit 0 (FM-Towns fixture present locally; CI skips fixture-gated assertions).