feat(quant): implement --noFragLengthDist; fragment-length weighting … #145

Job	Run time
build-test (macos-14, macos-arm64)	5m 30s
build-test (ubuntu-22.04, linux-x86_64)	5m 53s
build-test (ubuntu-24.04-arm, linux-aarch64)	4m 14s
build-test (macos-15-intel, macos-x86_64)	12m 45s
	28m 22s

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