adding support for model aliases in archgw

arch/arch_config_schema.yaml

@@ -7,6 +7,7 @@ properties:
       - v0.1
       - v0.1.0
       - 0.1-beta
+      - 0.2.0
   listeners:
     type: object
     additionalProperties: false
@@ -102,6 +103,19 @@ properties:
       additionalProperties: false
       required:
         - model
+
+  model_aliases:
+    type: object
+    patternProperties:
+      "^.*$":
+        type: object
+        properties:
+          target:
+            type: string
+        additionalProperties: false
+        required:
+          - target
+
   overrides:
     type: object
     properties:

arch/tools/cli/config_generator.py

@@ -208,6 +208,20 @@ def validate_and_render_schema():
 
     config_yaml["llm_providers"] = updated_llm_providers
 
+    # Validate model aliases if present
+    if "model_aliases" in config_yaml:
+        model_aliases = config_yaml["model_aliases"]
+        for alias_name, alias_config in model_aliases.items():
+            target = alias_config.get("target")
+            if not target:
+                raise Exception(
+                    f"Model alias '{alias_name}' must have a target specified"
+                )
+            if target not in model_name_keys:
+                raise Exception(
+                    f"Model alias '{alias_name}' targets '{target}' which is not defined as a model. Available models: {', '.join(sorted(model_name_keys))}"
+                )
+
     arch_config_string = yaml.dump(config_yaml)
     arch_llm_config_string = yaml.dump(config_yaml)