Baseline: docker stack, provisioning tools, test-data, gateway-as-files (pre-PrimeBAT build)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ignition/gateway/config/resources/local/config-mode.json

@@ -0,0 +1,7 @@
+{
+  "title": "Local",
+  "description": "Gateway configuration resources that are unique to the local instance, and will not be synchronized with a redundant pair, if any.",
+  "enabled": true,
+  "inheritable": false,
+  "parent": "core"
+}