86e9cb7026
- Refactored Node representation using compact bitfields for neighbor counts and nucleotides; added count_neighbors helper to compute_degrees() - Introduced StartIter iterator for unitig/longtigu generation with revised traversal semantics (e.g., interior node marking) - Added nucleotide() accessor to Kmer type for 2-bit extraction at position i - Renamed unitig.rs → longtigs, updated CLI command and output filenames to reflect "long t ig" - Extended extract_kmers() in scripts/compare.py with duplication statistics ```