4afd96c9ac
- Add VfsRaidLevel enum: - Single (no RAID) - RaidZ1 (single parity, similar to RAID 5) - RaidZ2 (double parity, similar to RAID 6) - RaidZ3 (triple parity) - Add VfsRaidBackend with: - Stripe-based data distribution across disks - Galois Field arithmetic for parity (P/Q/R) - gf_exp, gf_mul for Reed-Solomon coding - rebuild_disk() for disk recovery - Add VfsRaidConfig: - level (RAID level) - stripe_size (default 64KB) - disk_paths (storage devices) - All VfsBackend methods propagate to all disks - Foundation for ZFS-style software RAID All 229 tests pass.