chore: import upstream snapshot with attribution

showcase/integrations/claude-sdk-python/qa/readonly-state-agent-context.md

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+# QA: Readonly State (Agent Context) — Claude Agent SDK (Python)
+
+## Prerequisites
+
+- Demo is deployed and accessible
+- Agent backend is healthy
+- ANTHROPIC_API_KEY is set
+
+## Test Steps
+
+### 1. Basic Functionality
+
+- [ ] Navigate to `/demos/readonly-state-agent-context`
+- [ ] Verify the Agent Context card renders with Name, Timezone, Recent Activity controls
+- [ ] Verify the published context JSON pre is visible
+
+### 2. Context Wiring
+
+- [ ] Edit the Name input to "Dana"
+- [ ] Click the "Who am I?" suggestion
+- [ ] Verify the agent greets "Dana" in its reply
+- [ ] Change the timezone to "Asia/Tokyo"
+- [ ] Click "Plan my morning" — verify the agent references Tokyo time
+
+### 3. Error Handling
+
+- [ ] Verify no console errors on context updates
+- [ ] Verify the chat remains usable after multiple context changes
+
+## Expected Results
+
+- Agent references the current Name, Timezone, and Recent Activity
+- The context card cannot be modified by the agent (agent has no write tools)