ArraySplitter v1.6.0 - Recursive HOR decomposition

Features:
- Recursive HOR decomposition to find base-level monomers
- Two output files: .hors.tsv (HOR-level) and .monomers.tsv (base monomers)
- Autocorrelation threshold > 0.5 triggers further decomposition
- Minimum submonomer length: 5bp

Fixes:
- Use find_period for HOR preservation (max autocorr)
- Use known period directly in recursive decomposition
- Fixed maturin pyproject.toml version and license

Update macOS runners: macos-13 -> macos-15-intel, macos-14 -> macos-l…

…atest

macOS-13 runners are deprecated, see:
actions/runner-images#13046

Co-Authored-By: Claude Opus 4.5 <[email protected]>