docs: reshape runbooks into .agents/skills/<name>/SKILL.md (phase 4)

Problem: runbooks are agent-executable procedures but lived at the repo root,
separate from the other agent instruction now under .agents/.

Change:
- Move runbooks/<name>.md -> .agents/skills/<name>/SKILL.md (folder per skill,
  matching the wiki-hq skills layout). Frontmatter (name, risk_class, inputs,
  verification, docs_update_checklist, transition) preserved.
- Rewrite links (inbound from plans; between-skill siblings) via the move map.
- Update prose references in AGENTS.md, HERMES.md, .agents/OIKOS.md, and the
  operations schema; fix a pre-existing stale link to operations/commands.md.

No code consumed runbooks/ by path, so nothing else changes.

Verification: all SKILL.md frontmatter parses with valid risk_class; every
lifecycle transition resolves to an oikos/ontology.yaml state; broken-link
count 127 -> 126 (fixed one, introduced none).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.agents/skills/config-change-deploy/SKILL.md

@@ -0,0 +1,34 @@
+---
+name: config-change-deploy
+risk_class: config_mutation
+inputs: [service_name, change_description]
+verification: "curl -sf <service_url> (or homelab service <name> health)"
+docs_update_checklist: [doc_page, changelog]
+---
+
+# Config change + deploy
+
+Goal: change a tracked config repo (Caddy, Gitea customizations, an app's
+own repo) and get it live, safely.
+
+1. `homelab change preflight <service>` — current health, the service's
+   `config_repo`, its risk class, and the verification command to run
+   after. If risk class requires approval (`config_mutation` or
+   `destructive`), stop and get operator sign-off before editing — see
+   `oikos/policy.yaml`.
+2. Clone/pull the `config_repo` (never edit the backend's working tree
+   directly — tracked configs change by commit + push, per
+   [OIKOS.md](../../../OIKOS.md) conventions).
+3. Make the change, commit, push to `main`.
+4. The Gitea webhook fires the deploy pipeline for that repo (see
+   [infrastructure/auto-deploy.md](../../../knowledge/wiki/infrastructure/auto-deploy.md) for
+   the exact receiver/reload for this service).
+5. Run the preflight's verification command. If it fails, check
+   `homelab service <name> log` for the reload/restart error.
+6. Record the change: once `oikos/ledger.py` is wired into deploy tooling
+   (Week 3), this is automatic; until then, note the change and outcome
+   in the relevant investigation/plan doc.
+
+Docs-update checklist: update the service's `doc_page` if the change
+alters its behavior, ingress route, or ownership; add a changelog entry
+if the page has one.