Fix compatibility with @modelcontextprotocol/sdk 1.23+ (#84)

* Fix compatibility with @modelcontextprotocol/sdk 1.23+

Implement required abstract methods `assertTaskCapability` and
`assertTaskHandlerCapability` in App and AppBridge classes. These
were added to the Protocol base class in SDK 1.23+.

Also regenerates package-lock.json with valid npm registry versions
(previously had non-existent vite@6.4.1).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Add pkg-pr-new workflow for PR/commit publishing

Enables automatic publishing of any commit or PR to pkg.pr.new,
allowing consumers to install directly from git commits:

npm install https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/ext-apps@<commit-or-pr>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/app-bridge.ts

@@ -525,6 +525,22 @@ export class AppBridge extends Protocol<Request, Notification, Result> {
     // TODO
   }
 
+  /**
+   * Verify that task creation is supported for the given request method.
+   * @internal
+   */
+  protected assertTaskCapability(_method: string): void {
+    throw new Error("Tasks are not supported in MCP Apps");
+  }
+
+  /**
+   * Verify that task handler is supported for the given method.
+   * @internal
+   */
+  protected assertTaskHandlerCapability(_method: string): void {
+    throw new Error("Task handlers are not supported in MCP Apps");
+  }
+
   /**
    * Get the host capabilities passed to the constructor.
    *

src/app.ts

@@ -542,6 +542,22 @@ export class App extends Protocol<Request, Notification, Result> {
     // TODO
   }
 
+  /**
+   * Verify that task creation is supported for the given request method.
+   * @internal
+   */
+  protected assertTaskCapability(_method: string): void {
+    throw new Error("Tasks are not supported in MCP Apps");
+  }
+
+  /**
+   * Verify that task handler is supported for the given method.
+   * @internal
+   */
+  protected assertTaskHandlerCapability(_method: string): void {
+    throw new Error("Task handlers are not supported in MCP Apps");
+  }
+
   /**
    * Call a tool on the originating MCP server (proxied through the host).
    *