Disk-usage audit for DeepSeek Harness data directories.
- Total size, per-directory breakdown, largest directories, oversized-file warnings
- Cleanup suggestions (session logs can hit the ~512 MB stringify cap)
- CLI + agent-callable disk_audit tool, dsh-disk-audit/v1 reports
- Zero runtime deps, read-only; 6 unit tests, packed integration, dsh web boot smoke