chore(skills): promote runbook skills to managed-skills; drop superseded SKILL.md
- 31 new managed skills (anubis/arr/authentik/hermes/freetoken/podman/llm-swap
runbooks etc.) now tracked.
- Removed superseded skills: omp_harness_config, peon_ping_integration
(replaced by user-authored peon-ping-* managed skills),
rocmfp4-strix-benchmark-orchestration.
- New memory-root skills: niri_compositor_ops, omp_git_workflow,
omp_model_config, quadlet-media-migration, homelab-service-triage,
hermes-dankclaw-ops, frank-default-large-ops, caddy-auth-dns-playbook.