fix(showcase): repair langgraph-python manifest highlight paths and bump test snapshots

Three highlight paths in langgraph-python's manifest pointed at files
that don't exist after the PR CopilotKit#4694 reorganization:
  - hitl-in-chat → src/agents/hitl_in_chat.py (actually hitl_in_chat_agent.py)
  - chat-slots → custom-welcome-screen.tsx (file doesn't exist; use slot-wrappers.tsx)
  - mcp-apps → copilotkit-mcp-apps/route.ts (actually .../[[...slug]]/route.ts)

The bundler walks every highlight at build time; one missing path aborts
the whole CI step. Fix all three.

Test snapshot counts in generate-catalog and generate-registry hardcoded
40 features / 720 cells / 702 total. With the two new feature IDs added
to the registry (reasoning-default + reasoning-custom), counts shift to
42 / 756 / 738; the LGP-specific cell distribution moved from
39 wired + 1 stub + 0 unshipped to 35 wired + 1 stub + 6 unshipped, and
the registry-side LGP feature/demo count drops to 36 (PR CopilotKit#4694 trimmed
4 items from the manifest's features list).

Author: AlemTuzlak

showcase/integrations/langgraph-python/manifest.yaml

@@ -152,7 +152,7 @@ demos:
     highlight:
       - src/app/demos/hitl-in-chat/page.tsx
       - src/app/demos/hitl-in-chat/time-picker-card.tsx
-      - src/agents/hitl_in_chat.py
+      - src/agents/hitl_in_chat_agent.py
       - src/app/api/copilotkit/route.ts
   - id: hitl-in-app
     name: "Human in the Loop: In-App"
@@ -272,7 +272,7 @@ demos:
     highlight:
       - src/agents/main.py
       - src/app/demos/chat-slots/page.tsx
-      - src/app/demos/chat-slots/custom-welcome-screen.tsx
+      - src/app/demos/chat-slots/slot-wrappers.tsx
       - src/app/api/copilotkit/route.ts
   - id: headless-simple
     name: "Headless UI: Simple"
@@ -335,7 +335,7 @@ demos:
     highlight:
       - src/agents/interrupt_agent.py
       - src/app/demos/gen-ui-interrupt/page.tsx
-      - src/app/demos/gen-ui-interrupt/time-picker-card.tsx
+      - src/app/demos/gen-ui-interrupt/_components/time-picker-card.tsx
       - src/app/api/copilotkit/route.ts
   - id: declarative-gen-ui
     name: "Declarative UI: A2UI"
@@ -376,7 +376,7 @@ demos:
     highlight:
       - src/agents/mcp_apps_agent.py
       - src/app/demos/mcp-apps/page.tsx
-      - src/app/api/copilotkit-mcp-apps/route.ts
+      - src/app/api/copilotkit-mcp-apps/[[...slug]]/route.ts
   - id: readonly-state-agent-context
     name: Frontend Context Sharing
     description: Frontend provides read-only context to the agent via useAgentContext

showcase/scripts/__tests__/generate-catalog.test.ts

@@ -95,7 +95,7 @@ describe("Catalog Generator", () => {
     }
   });
 
-  it("cross-join produces 720 cells (40 features x 18 integrations); metadata.total_cells excludes docs-only", () => {
+  it("cross-join produces 756 cells (42 features x 18 integrations); metadata.total_cells excludes docs-only", () => {
     runGenerator();
     const catalog = readCatalog();
 
@@ -109,15 +109,15 @@ describe("Catalog Generator", () => {
       (c: any) => c.manifestation === "starter",
     );
 
-    expect(integrated.length).toBe(720); // 40 features x 18 integrations
+    expect(integrated.length).toBe(756); // 42 features x 18 integrations
     expect(starters.length).toBe(0);
-    expect(catalog.cells.length).toBe(720);
+    expect(catalog.cells.length).toBe(756);
     // total_cells excludes docs-only features (currently 1 feature x 18 integrations = 18)
-    expect(catalog.metadata.total_cells).toBe(702);
+    expect(catalog.metadata.total_cells).toBe(738);
     expect(catalog.metadata.docs_only).toBe(18);
   });
 
-  it("LGP has 40 cells: 37 wired + 1 stub + 2 unshipped", () => {
+  it("LGP has 42 cells: 35 wired + 1 stub + 6 unshipped", () => {
     runGenerator();
     const catalog = readCatalog();
 
@@ -126,16 +126,15 @@ describe("Catalog Generator", () => {
         c.integration === "langgraph-python" &&
         c.manifestation === "integrated",
     );
-    expect(lgpCells.length).toBe(40); // One cell per feature
+    expect(lgpCells.length).toBe(42); // One cell per feature
 
     const wired = lgpCells.filter((c: any) => c.status === "wired");
     const stub = lgpCells.filter((c: any) => c.status === "stub");
     const unshipped = lgpCells.filter((c: any) => c.status === "unshipped");
 
-    // LGP has 40 features: 39 wired + 1 stub (cli-start) + 0 unshipped
-    expect(wired.length).toBe(39);
+    expect(wired.length).toBe(35);
     expect(stub.length).toBe(1);
-    expect(unshipped.length).toBe(0);
+    expect(unshipped.length).toBe(6);
   });
 
   it("stub detection: LGP/cli-start has stub status (demo exists, no route)", () => {
@@ -198,7 +197,7 @@ describe("Catalog Generator", () => {
 
     expect(catalog.metadata).toBeDefined();
     // total_cells excludes docs-only features
-    expect(catalog.metadata.total_cells).toBe(702);
+    expect(catalog.metadata.total_cells).toBe(738);
 
     // Headline counts exclude docs-only cells; must sum to total_cells.
     expect(

showcase/scripts/__tests__/generate-registry.test.ts

@@ -68,8 +68,8 @@ describe("Registry Generator", () => {
     expect(langgraph.name).toBe("LangGraph (Python)");
     expect(langgraph.category).toBe("popular");
     expect(langgraph.language).toBe("python");
-    expect(langgraph.features.length).toBe(40);
-    expect(langgraph.demos.length).toBe(40);
+    expect(langgraph.features.length).toBe(36);
+    expect(langgraph.demos.length).toBe(36);
   });
 
   it("sorts integrations by sort_order", () => {