Introduces a memory-aware scheduling strategy for parallel partition merging that replaces unbounded concurrency with a First-Fit Decreasing approach gated by a thread-safe `MemoryBudget` semaphore. An adaptive expansion factor, seeded by a sequential pilot run, dynamically caps concurrent workers to prevent hashbrown OOMs. Adds a `--budget-fraction` CLI flag to configure RAM allocation, enhances the CLI to accept multiple indexes, and introduces comprehensive partition diagnostics including memory utilization tracking, concurrency metrics, and statistical summaries with ASCII histograms. Updates documentation and navigation accordingly.
Introduces allocation-free `sum()` and `count_nonzero()` methods for compact integer vectors, extending the `ColumnWeights` trait with `partial_kmer_counts`. Adds parallel partition scanning to the k-mer index for computing per-genome distinct k-mer counts, and exposes a new `--stats` CLI flag to output these statistics as CSV.
Eric Coissac