port build_host_files.py to Go, simplify Hermes MCP, cutover final

- cmd/hermes/main.go: removed redundant /mcp endpoint — Hermes gateway now
  serves only /query + /healthz. MCP goes direct to API (:8090/mcp).
- cmd/oikos/build_hosts.go: Go port of mcp/build_host_files.py as
  'oikos build-hosts'. Reads inventory.yaml, writes hosts/*.yaml.
- cmd/oikos/main.go: added build-hosts role.
- docker-compose.yml: hermes service simplified.
- apps/105: all 6 Oikos services stopped + disabled (confirmed inactive).
- Watchdog cron installed, API stop/restart verified.
- Infisical bootstrap pending (image pull timeout — retry separately).

Remaining:
- Port bin/homelab CLI to Go (separate plan — large surface)
- Caddy DNS push (needs dtoro/caddy-conf repo access)
- Rollback drill

hosts/dns.yaml

@@ -1,29 +1,29 @@
-# Generated by mcp/build_host_files.py from inventory.yaml.
-# Do NOT edit by hand — your changes will be overwritten.
-# Source of truth: ../inventory.yaml
-name: dns
-kind: lxc
-os: linux
-role: dns-server
-state: active
+# Generated by oikos build-hosts from inventory.yaml.
+# Do NOT edit by hand.
+
 host: hubris
-pve_id: 107
+kind: lxc
 lan_ip: 192.168.8.2
-mesh_globals:
-  primary: netbird
-  accepted:
-  - netbird
-  - tailscale
-runs:
-- dns
-services_hosted:
-- name: dns
-  backend: dns
-  note: Technitium DNS, split-horizon zone
-  doc_page: knowledge/wiki/containers/107-dns.md
-  risk_notes: "LAN-wide resolver \u2014 misconfig breaks name resolution for every client"
-notes:
-- Technitium DNS, split-horizon zone for *.hubris.network
-- Primary DNS for 192.168.8.0/24 LAN (inventory.services.dns references this)
 mcp_endpoint: https://mcp.hubris.network/mcp
+mesh_globals:
+  accepted:
+    - netbird
+    - tailscale
+  primary: netbird
+name: dns
+notes:
+  - Technitium DNS, split-horizon zone for *.hubris.network
+  - Primary DNS for 192.168.8.0/24 LAN (inventory.services.dns references this)
+os: linux
+pve_id: 107
+role: dns-server
+runs:
+  - dns
 secrets_issuance_endpoint: https://secrets.hubris.network/issue
+services_hosted:
+  - backend: dns
+    doc_page: knowledge/wiki/containers/107-dns.md
+    name: dns
+    note: Technitium DNS, split-horizon zone
+    risk_notes: LAN-wide resolver — misconfig breaks name resolution for every client
+state: active