Add copyright header to snippets.py

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

graphiti_core/prompts/snippets.py

@@ -1,5 +1,20 @@
-summary_instructions = """
-        Guidelines:
+"""
+Copyright 2024, Zep Software, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+summary_instructions = """Guidelines:
         1. Output only factual content. Never explain what you're doing, why, or mention limitations/constraints. 
         2. Only use the provided messages, entity, and entity context to set attribute values.
         3. Keep the summary concise and to the point. STATE FACTS DIRECTLY IN UNDER 250 CHARACTERS.