chore: import upstream snapshot with attribution

showcase/integrations/claude-sdk-python/qa/frontend-tools-async.md

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+# QA: Frontend Tools (Async) — 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/frontend-tools-async`
+- [ ] Verify the chat renders
+- [ ] Click the "Find project-planning notes" suggestion
+- [ ] Verify a NotesCard appears briefly in loading state ("Querying local notes DB...")
+- [ ] After ~500ms, verify the card shows matching notes (Q2 kickoff, migrate auth to passkeys, retrospective notes, career planning)
+
+### 2. Feature-Specific Checks
+
+- [ ] Search for "auth" — verify the "migrate auth to passkeys" note is returned
+- [ ] Ask "Do I have notes tagged reading?" — verify the Book recommendations note appears
+- [ ] Search for "nonsense-keyword-no-match" — verify "No notes matched." empty state
+
+### 3. Error Handling
+
+- [ ] Verify no console errors during search
+- [ ] Verify the loading state transitions to complete within a few seconds
+
+## Expected Results
+
+- NotesCard with `data-testid="notes-card"` displays matching notes
+- Each note rendered with `data-testid="note-<id>"` and tags