Introduce the `obipipeline` dependency and refactor merge and partition logic to leverage parallel execution. Update `merge_partitions` to use rayon with dynamic memory budgeting and concurrency control via a pilot run. Refactor Pass 1 to concurrently read unitigs, filter kmers through a shared `LayeredMap`, and populate the graph safely. Simplify diagnostics to report total kmer counts and replace manual flags with graph length validation.
Eric Coissac
ba49af6f9e