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/caddy.yaml

@@ -1,35 +1,34 @@
-# 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: caddy
-kind: lxc
-os: linux
-role: reverse-proxy
-state: active
+# Generated by oikos build-hosts from inventory.yaml.
+# Do NOT edit by hand.
+
 host: hubris
-pve_id: 121
+kind: lxc
 lan_ip: 192.168.8.175
-mesh_globals:
-  primary: netbird
-  accepted:
-  - netbird
-  - tailscale
-peers:
-- authentik
-- gitea
-runs:
-- caddy
-services_hosted:
-- name: caddy
-  backend: caddy
-  role: reverse-proxy
-  note: terminates all *.hubris.network
-  doc_page: knowledge/wiki/containers/121-caddy.md
-  config_repo: dtoro/caddy-conf
-  risk_notes: "wide blast radius \u2014 every *.hubris.network route rides on it (see oikos/policy.yaml\
-    \ service_overrides)"
-notes:
-- Terminates all *.hubris.network
-- /etc/caddy is a git checkout of dtoro/caddy-conf
 mcp_endpoint: https://mcp.hubris.network/mcp
+mesh_globals:
+  accepted:
+    - netbird
+    - tailscale
+  primary: netbird
+name: caddy
+notes:
+  - Terminates all *.hubris.network
+  - /etc/caddy is a git checkout of dtoro/caddy-conf
+os: linux
+peers:
+  - authentik
+  - gitea
+pve_id: 121
+role: reverse-proxy
+runs:
+  - caddy
 secrets_issuance_endpoint: https://secrets.hubris.network/issue
+services_hosted:
+  - backend: caddy
+    config_repo: dtoro/caddy-conf
+    doc_page: knowledge/wiki/containers/121-caddy.md
+    name: caddy
+    note: terminates all *.hubris.network
+    risk_notes: wide blast radius — every *.hubris.network route rides on it (see oikos/policy.yaml service_overrides)
+    role: reverse-proxy
+state: active