Eric Coissac
24afd74e2f
Decouple index generation by introducing `build_unitig_idx()` for retroactive `.idx` creation and optional immediate writing on close. Add `open_sequential()` for index-less iteration while enforcing index requirements for random access. Refactor the MPHF layer to pre-generate the unitig index for parallel random access, integrate `rayon` for k-mer processing, and enforce mapping integrity via duplicate slot validation. Additionally, implement `build_exact_evidence()` to reconstruct evidence from existing artifacts, and update tests to leverage the new index generation and simplified k-mer iteration helpers.
toto