- knowledge.go: scan tags as []string from pgx (not JSON)
- seed.go: convert tags to PG array format, fix runbook applies_to_type
- convert-wiki.py: fix entity slug prefixes to match inventory.yaml
(host: not proxmox-host:, ws: not workstation:, service:homelab-mcp with hyphen)
- convert-wiki.py: read from archive/knowledge/ since wiki was archived