pdf: --pages A-B window + memory-bounded referenced images (#80) #472

Job	Run time
fmt · clippy (pinned)	30s
msrv (1.85 core · 1.88 workspace)	33s
check (cuda, ubuntu-latest)	43s
test (stable)	2m 13s
check (directml, windows-latest)	1m 46s
wasm32 (declarative converters)	54s
check (cuda,tensorrt, ubuntu-latest)	46s
check (coreml, macos-latest)	55s
release & publish	-1s
	8m 19s

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