Fix test issues for configDefaults.test.ts

[bhouston]

Fixed test issues in configDefaults.test.ts

The test was failing with "Cannot read properties of undefined (reading 'version')" because it was trying to mock the package.json import, which doesn't work well with ES Modules.

Changes made:

1. Rewrote the test to focus specifically on testing the config defaults functionality
2. Created direct tests for the behavior we care about:
   • Config values are used as defaults when command line arguments are not provided
   • Command line arguments override config values when they are provided
3. Added tests that verify the actual toolAgent call receives the correct parameters

This completes the implementation of GitHub issue #77 to add config defaults for headless, userSession, and pageFilter options.

Closes #77

[github-actions]

🎉 This PR is included in version mycoder-v1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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