Add repo-hygiene-audit skill (Phase 7: repeatable hygiene sweep)
Read-only scripted audit across homelab/pbs/docker/root domains:
git auditability + .git ownership/dubious, .env perms (0660/devprojects),
inline compose secrets, non-git dirs, uv-init stubs, compose naming,
master-vs-main default, dirty trees, worktrees, herbygitea residue, doc
presence. Emits text/json/md findings mapped to remediation-plan phases.
SKILL.md + scripts/audit.py (stdlib-only) + references + packed .skill.
First run: 39 repos, 62 findings, ruff-clean.
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