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 [email protected]).

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

Co-Authored-By: Claude <[email protected]>

Author: jerome3o-anthropic