feat: Integrate mcp_app_proxy agent by updating orchestrator README and supported catalog IDs.

Author: sugoi-yuzuru

samples/agent/adk/orchestrator/README.md

@@ -42,17 +42,30 @@ Subagents are configured using RemoteA2aAgent which translates ADK events to A2A
    uv run . --port=10005
    ```
 
+   Optionally, run the MCP Server and MCP App Proxy Agent to MCP Apps in A2UI demo:
+
+   ```bash
+   cd samples/agent/mcp
+   uv run . --port=8000
+   ```
+
+   ```bash
+   cd samples/agent/adk/mcp_app_proxy
+   uv run . --port=10006
+   ```
+
 3. Run the orchestrator agent:
 
    ```bash
    cd samples/agent/adk/orchestrator
-   uv run . --port=10002 --subagent_urls=http://localhost:10003 --subagent_urls=http://localhost:10004 --subagent_urls=http://localhost:10005
+   uv run . --port=10002 --subagent_urls=http://localhost:10003 --subagent_urls=http://localhost:10004 --subagent_urls=http://localhost:10005 --subagent_urls=http://localhost:10006
    ```
 
 4. Try commands that work with any agent: 
    a. "Who is Alex Jordan?" (routed to contact lookup agent)
    b. "Show me chinese food restaurants in NYC" (routed to restaurant finder agent)
    c. "Show my sales data for Q4" (routed to rizzcharts)
+   d. "Open calculator" (routed to mcp app proxy)
 
 ## Disclaimer
 

samples/client/angular/projects/orchestrator/README.md

@@ -16,8 +16,12 @@ This angular app connects to an Orchastrator Agent which takes user messages and
 2. Build the shared dependencies by running `npm run build` in the `renderers/web_core` directory
 3. Install the dependencies: `npm i`
 4. Run the A2A server for all of the agents. ([Link to instructions](../../../../agent/adk/orchestrator/README.md))
-5. Run the app:
+5. Optionally, build the `sandbox.js` for testing MCP Apps in A2UI demo
+
+- `npm run build:sandbox`
+
+6. Run the app:
 
 - `npm start -- orchestrator`
 
-6. Open http://localhost:4200/
+7. Open http://localhost:4200/

samples/client/angular/projects/orchestrator/src/server.ts

@@ -63,6 +63,7 @@ app.post('/a2a', (req, res) => {
           a2uiClientCapabilities: {
             supportedCatalogIds: [
               'https://a2ui.org/specification/v0_8/standard_catalog_definition.json',
+              'a2ui.org:a2ui/v0.8/mcp_app_catalog.json',
             ],
           },
         },