Initial implementation: P1-P4 + audit fixes#1

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SRjoeee wants to merge 9 commits intomainfrom

feature/initial-implementation

Commits on Apr 16, 2026

Initial scaffolding: P1 (T1, T2, T9 skeleton)
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P2: quality metrics, PyAV decoder, stratified sampler
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P3: extract CLI and end-to-end benchmark
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P4: Apple Vision saliency + documentation finalisation
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Review fixes: narrow CLI exception, drop walrus, full Args/Returns/Raises docstrings
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Add quality golden fixture: bit-precision contract for compute_quality
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T5 missing tests: quality-gradient sampler check + extract_all regression snapshot
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Audit cosmetics: tighten docs ref, info lines to stderr, add example
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Review follow-up: fix cross-references, saliency docstring, tighten PyAV pin
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