delete WaveletReverse decompress paths, decompress task-graph scheduling, and the classic int16 pipeline (minus whatever classic keeps from phase 1).
classic T1 stays: it is mercury's block coder through the shim.
encode is untouched.
policy: builds without rust fall back to classic silently. after this phase that fallback is gone, so either rust becomes a hard build requirement for decode or two decoders live forever. current lean: rust required.
delete WaveletReverse decompress paths, decompress task-graph scheduling, and the classic int16 pipeline (minus whatever classic keeps from phase 1).
classic T1 stays: it is mercury's block coder through the shim.
encode is untouched.
policy: builds without rust fall back to classic silently. after this phase that fallback is gone, so either rust becomes a hard build requirement for decode or two decoders live forever. current lean: rust required.