chore: import upstream snapshot with attribution

python/packages/purview/AGENTS.md

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+# Purview Package (agent-framework-purview)
+
+Integration with Microsoft Purview for data governance and policy enforcement.
+
+## Main Classes
+
+### Middleware
+
+- **`PurviewPolicyMiddleware`** - Agent middleware for Purview policy enforcement
+- **`PurviewChatPolicyMiddleware`** - Chat-level middleware for policy enforcement
+
+### Configuration
+
+- **`PurviewSettings`** - Pydantic settings for Purview configuration
+- **`PurviewAppLocation`** / **`PurviewLocationType`** - Location configuration
+
+### Caching
+
+- **`CacheProvider`** - Cache provider for Purview policy caching
+
+### Exceptions
+
+- **`PurviewAuthenticationError`** - Authentication failures (inherits from `IntegrationInvalidAuthException`)
+- **`PurviewRateLimitError`** - Rate limit exceeded (inherits from `IntegrationException` via `PurviewServiceError`)
+- **`PurviewRequestError`** / **`PurviewServiceError`** - Request/service errors (inherit from `IntegrationException`)
+- **`PurviewPaymentRequiredError`** - Payment required (inherits from `IntegrationException` via `PurviewServiceError`)
+
+## Usage
+
+```python
+from agent_framework.microsoft import PurviewPolicyMiddleware, PurviewSettings
+
+settings = PurviewSettings(...)
+middleware = PurviewPolicyMiddleware(settings=settings)
+agent = Agent(..., middleware=[middleware])
+```
+
+## Import Path
+
+```python
+from agent_framework.microsoft import PurviewPolicyMiddleware
+# or directly:
+from agent_framework_purview import PurviewPolicyMiddleware
+```