V3 deterministic filesystem size-inspection capability pack. By-value connector composition (service_kind=cli, no separate ingredient): one local du CLI ingredient exposes bounded read-only disk-usage metadata for one trusted local path. The operations return summary size output only: KiB disk usage, human-readable disk usage, apparent-size KiB, and a fixed readiness probe. They do not return file content, list child paths, emit per-file recursive rows, read stdin, accept file lists, follow symlinks explicitly, cross-device-control flags, ignore masks, caller-supplied thresholds, environment overrides, arbitrary du flags, write files, or use a shell wrapper. Editable paths reject flag-like values, URL-like references, and scp-style remotes. Requires a POSIX-compatible du on PATH. Local and no-egress.