Post-dependency update, npm install hadn't been run and linting revealed a missing return type annotation in test mocks.

Changes

• src/index.test.ts: Added explicit : string return type to mocked greet function to satisfy @typescript-eslint/explicit-function-return-type
• package-lock.json: Refreshed after installing dependencies

// Before
jest.mock('./index.js', () => ({
  greet: () => 'Hello from AgentKit CLI!',
}));

// After
jest.mock('./index.js', () => ({
  greet: (): string => 'Hello from AgentKit CLI!',
}));

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