chore: import upstream snapshot with attribution

showcase/integrations/langgraph-python/qa/shared-state-read.md

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+# QA: Shared State (Reading) — LangGraph (Python)
+
+## Prerequisites
+
+- Demo is deployed and accessible
+- Agent backend is healthy (check /api/health)
+
+## Test Steps
+
+### 1. Basic Functionality
+
+- [ ] Navigate to the shared-state-read demo page
+- [ ] Verify the recipe card form loads (`data-testid="recipe-card"`)
+- [ ] Verify the CopilotSidebar opens by default with title "AI Recipe Assistant"
+- [ ] Send a message via the sidebar
+- [ ] Verify the agent responds
+
+### 2. Feature-Specific Checks
+
+#### Initial Recipe State
+
+- [ ] Verify the recipe title input shows "Make Your Recipe"
+- [ ] Verify the cooking time dropdown defaults to "45 min"
+- [ ] Verify the skill level dropdown defaults to "Intermediate"
+- [ ] Verify the default ingredients are displayed:
+  - [ ] Carrots (3 large, grated) with carrot emoji
+  - [ ] All-Purpose Flour (2 cups) with wheat emoji
+- [ ] Verify the default instruction is displayed: "Preheat oven to 350°F (175°C)"
+
+#### Suggestions
+
+- [ ] Verify "Create Italian recipe" suggestion is visible
+- [ ] Verify "Make it healthier" suggestion is visible
+- [ ] Verify "Suggest variations" suggestion is visible
+
+#### Recipe Editing (Local State)
+
+- [ ] Edit the recipe title and verify it updates
+- [ ] Change the skill level dropdown and verify it updates
+- [ ] Change the cooking time dropdown and verify it updates
+- [ ] Toggle a dietary preference checkbox (e.g. "Vegetarian") and verify it's checked
+- [ ] Click "+ Add Ingredient" (`data-testid="add-ingredient-button"`) and verify a new empty row appears
+- [ ] Edit an ingredient name and amount
+- [ ] Remove an ingredient by clicking the "x" button
+- [ ] Click "+ Add Step" and verify a new instruction row appears
+- [ ] Edit an instruction and verify it saves
+- [ ] Remove an instruction by clicking the "x" button
+
+#### AI-Powered Recipe Updates (useAgent with shared state)
+
+- [ ] Click "Create Italian recipe" suggestion
+- [ ] Verify the agent updates the recipe title, ingredients, and instructions
+- [ ] Verify the ping indicator appears on changed sections
+- [ ] Verify the "Improve with AI" button (`data-testid="improve-button"`) changes to "Please Wait..." while loading
+- [ ] Click "Improve with AI" and verify the recipe is enhanced
+
+#### Agent Reads Frontend State
+
+- [ ] Edit the recipe (change title, add ingredients)
+- [ ] Ask the agent "What recipe am I making?"
+- [ ] Verify the agent's response references the current recipe state
+
+### 3. Error Handling
+
+- [ ] Send an empty message (should be handled gracefully)
+- [ ] Verify no console errors during normal usage
+- [ ] Verify the "Improve with AI" button is disabled while loading
+
+## Expected Results
+
+- Recipe card and sidebar load within 3 seconds
+- Agent responds within 10 seconds
+- Recipe state syncs bidirectionally between UI and agent
+- Ping indicators highlight changed sections
+- No UI errors or broken layouts