Add Placement (Infrastructure) section to Nimmerworld README

README.md

@@ -130,4 +130,20 @@ Rule:
   - simple relational modes,
   - backend-driven behavior.
 
+## Placement (Infrastructure)
+
+Nimmerworld (dev) is hosted as a dedicated Proxmox VM on Saturn, wired to the 10G Cubes VLAN for proximity to the vLLM endpoint and cluster.
+
+- VM ID: 123
+- Hostname: nimmerworld-dev.eachpath.local
+- IP: 10.0.30.123/24
+- VLAN: 30 (cubes)
+- Network: vmbr3 (10G rail via bond-saturn → spine-crs309)
+
+Infra references (single source of truth):
+- eachpath.local/saturn.eachpath.local/vms/nimmerworld-dev.eachpath.local/ – VM hostfile
+- eachpath.local/eachpath.local.md – network and Saturn VM overview
+
+All runtime/architecture details live here (nimmerworld.eachpath.local). Infra specifics are not duplicated.
+
 **Version:** 0.1 | **Updated:** 2026-07-03