Fixes for library client (#587)

Library client used _server_ side types which was no bueno. The fix here
is not the completely correct fix but it is good for enough and for the
demo notebook.

docs/resources/llama-stack-spec.html

@@ -4368,14 +4368,11 @@
                     "step_id": {
                         "type": "string"
                     },
-                    "model_response_text_delta": {
+                    "text_delta": {
                         "type": "string"
                     },
                     "tool_call_delta": {
                         "$ref": "#/components/schemas/ToolCallDelta"
-                    },
-                    "tool_response_text_delta": {
-                        "type": "string"
                     }
                 },
                 "additionalProperties": false,

docs/resources/llama-stack-spec.yaml

@@ -132,8 +132,6 @@ components:
           const: step_progress
           default: step_progress
           type: string
-        model_response_text_delta:
-          type: string
         step_id:
           type: string
         step_type:
@@ -143,10 +141,10 @@ components:
           - shield_call
           - memory_retrieval
           type: string
+        text_delta:
+          type: string
         tool_call_delta:
           $ref: '#/components/schemas/ToolCallDelta'
-        tool_response_text_delta:
-          type: string
       required:
       - event_type
       - step_type