Introduce `MemoryBitVec` and `MemoryIntVec` for efficient in-memory storage with hybrid compression and overflow handling. Implement `BitSlice`, `BitSliceMut`, `IntSlice`, and `IntSliceMut` traits across persistent and memory-backed types to enable generic slice operations and bitwise/arithmetic overloads. Add `col_persist` and `col_as_memory` methods to `BitMatrix` and `IntMatrix` for efficient column extraction. Align with the new single-pass rebuild architecture by supporting fast kmer filtering and matrix rebuilding. Includes comprehensive tests and profiling instrumentation for the packing phase.
Eric Coissac
cde6457eea