Streamline AI docs, add skills, enforce symlink-everything policy

- Add .claude/skills/: homelab-context (auto-loads key facts each session),
  homelab-status (/homelab-status command), deploy-config (symlink setup guide)
- Remove AGENTS.md and ai/sessions/: superseded by plan mode + skill system
- Remove 4 obsolete session commands (session-start/list/switch, reload-instructions)
- Rewrite CLAUDE.md: remove duplicate content, enforce symlink policy, clarify sudo pattern
- Trim docs/services.md from 946 to ~230 lines: remove planning-era content,
  keep install steps and current status for migration reference
- Strip stale "sudo cp" deploy header from ssh-honeypot.service (now symlinked to repo)
- Update TODO.md: mark NAS migration and symlink tasks done, add jellyfin upgrade warning

.claude/skills/homelab-status/SKILL.md

@@ -0,0 +1,15 @@
+---
+name: homelab-status
+description: Check status of all homelab services at once.
+disable-model-invocation: true
+allowed-tools: Bash(docker *), Bash(systemctl *), Bash(mountpoint *), Bash(nginx *)
+---
+
+Check and report status of all homelab services:
+
+1. Run `docker ps --format "table {{.Names}}\t{{.Status}}\t{{.Ports}}"` to show all containers
+2. Run `systemctl is-active nginx copyparty netdata` to show systemd service states
+3. Run `mountpoint /mnt/nas` to confirm NAS is mounted
+4. Run `sudo nginx -t` to verify nginx config is valid
+5. Report any services that are stopped, failed, or unhealthy
+6. Note any containers not running that should be (gitea, jellyfin, portainer, qbittorrent, nextcloud)