chore: import upstream snapshot with attribution

showcase/integrations/claude-sdk-python/qa/tool-rendering-default-catchall.md

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+# QA: Tool Rendering (Default Catch-all) — 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/tool-rendering-default-catchall`
+- [ ] Verify the chat renders
+- [ ] Click "Weather in SF" — verify the agent calls `get_weather`
+- [ ] Verify the BUILT-IN `DefaultToolCallRenderer` card appears inline
+
+### 2. Feature-Specific Checks
+
+- [ ] Verify the tool-call card shows the tool name, status pill (Running → Done), and Arguments/Result sections
+- [ ] Try "Find flights" — verify multiple tool calls render
+
+### 3. Error Handling
+
+- [ ] Verify no console errors during tool calls
+
+## Expected Results
+
+- CopilotKit's package-provided default tool card renders every tool call (no custom renderers)