hosts: add nix-cache02 build host

New build host to replace nix-cache01 with:
- 8 CPU cores, 16GB RAM, 200GB disk
- Static IP 10.69.13.25

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

terraform/vms.tf

@@ -86,6 +86,13 @@ locals {
       disk_size = "60G"
       vault_wrapped_token = "s.uXpdoGxHXpWvTsGbHkZuq1jF"
     }
+    "nix-cache02" = {
+      ip        = "10.69.13.25/24"
+      cpu_cores = 8
+      memory    = 16384
+      disk_size = "200G"
+      vault_wrapped_token = "s.C5EuHFyULACEqZgsLqMC3cJB"
+    }
   }
 
   # Compute VM configurations with defaults applied