chore: import upstream snapshot with attribution

showcase/integrations/ms-agent-python/qa/shared-state-write.md

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+# QA: Shared State (Writing) — MS Agent Framework (Python)
+
+## Prerequisites
+
+- Demo is deployed and accessible
+- Agent backend is healthy (check /api/health)
+
+## Test Steps
+
+### 1. Basic Functionality
+
+- [ ] Navigate to the shared-state-write demo page
+- [ ] Verify the chat interface loads with title "Shared State (Writing)"
+- [ ] Verify the chat input placeholder "Type a message..." is visible
+- [ ] Send a basic message (e.g. "Hello! What can you do?")
+- [ ] Verify the agent responds
+
+### 2. Feature-Specific Checks
+
+#### Suggestions
+
+- [ ] Verify "Get started" suggestion button is visible
+
+#### Note: Stub Demo
+
+> **Status: Stub** — This demo is currently a stub (TODO: implement)
+
+- [ ] Verify the basic CopilotChat loads and accepts messages
+- [ ] Verify the agent responds to messages
+- [ ] No custom UI components are expected beyond the chat interface
+
+### 3. Error Handling
+
+- [ ] Send an empty message (should be handled gracefully)
+- [ ] Verify no console errors during normal usage
+
+## Expected Results
+
+- Chat loads within 3 seconds
+- Agent responds within 10 seconds
+- No UI errors or broken layouts