chore: import upstream snapshot with attribution

python/packages/mistral/README.md

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+# Get Started with Microsoft Agent Framework Mistral AI
+
+Please install this package:
+
+```bash
+pip install agent-framework-mistral --pre
+```
+
+and see the [README](https://github.com/microsoft/agent-framework/tree/main/python/README.md) for more information.
+
+## Embedding Client
+
+The `MistralEmbeddingClient` provides embedding generation using Mistral AI models.
+
+### Quick Start
+
+```python
+from agent_framework_mistral import MistralEmbeddingClient
+
+# Using environment variables (MISTRAL_API_KEY, MISTRAL_EMBEDDING_MODEL)
+client = MistralEmbeddingClient()
+
+# Or passing parameters directly
+client = MistralEmbeddingClient(
+    model="mistral-embed",
+    api_key="your-api-key",
+)
+
+# Generate embeddings
+result = await client.get_embeddings(["Hello, world!", "How are you?"])
+for embedding in result:
+    print(f"Dimensions: {embedding.dimensions}")
+    print(f"Vector: {embedding.vector[:5]}...")
+```
+
+### Configuration
+
+| Environment Variable | Description |
+|---|---|
+| `MISTRAL_API_KEY` | Your Mistral AI API key |
+| `MISTRAL_EMBEDDING_MODEL` | Embedding model name (e.g., `mistral-embed`) |
+| `MISTRAL_SERVER_URL` | Optional server URL override |