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/romm.yaml

@@ -1,26 +1,26 @@
-# 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: romm
-kind: lxc
-os: linux
-role: rom-manager
-state: active
+# Generated by oikos build-hosts from inventory.yaml.
+# Do NOT edit by hand.
+
 host: strong
-pve_id: 134
+kind: lxc
 lan_ip: 192.168.8.249
-mesh_globals:
-  primary: netbird
-  accepted:
-  - netbird
-  - tailscale
-mounts:
-- /mnt/media_local
-public_host: roms.hubris.network
-notes:
-- Docker host for RomM (romm.app) self-hosted ROM manager. Created 2026-07-05.
-- MariaDB sidecar at /opt/romm/docker-compose.yml.
-- ROMs on ludo-lvm media volume at /mnt/media_local/roms.
-- 1 core / 2 GiB RAM / 16 GiB rootfs (ludo-lvm).
 mcp_endpoint: https://mcp.hubris.network/mcp
+mesh_globals:
+  accepted:
+    - netbird
+    - tailscale
+  primary: netbird
+mounts:
+  - /mnt/media_local
+name: romm
+notes:
+  - Docker host for RomM (romm.app) self-hosted ROM manager. Created 2026-07-05.
+  - MariaDB sidecar at /opt/romm/docker-compose.yml.
+  - ROMs on ludo-lvm media volume at /mnt/media_local/roms.
+  - 1 core / 2 GiB RAM / 16 GiB rootfs (ludo-lvm).
+os: linux
+public_host: roms.hubris.network
+pve_id: 134
+role: rom-manager
 secrets_issuance_endpoint: https://secrets.hubris.network/issue
+state: active