chore: Initial work to add agent config schema

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

Author: mvicknr

.fleetControl/configurationDefinitions.yml

@@ -17,4 +17,5 @@ configurationDefinitions:
     description: Python agent configuration
     type: agent-config
     version: 1.0.0
-# will add schema information here later
+    schema: ./schemas/config.json
+    format: ini