feat: make --default the default, and add an --eu flag

[joshsny]

We want to make the command simpler and less verbose.

Adds tests for the CLI args, since there were not any previously.

[Copilot]

Pull Request Overview

This PR makes the CLI less verbose by flipping the default behavior of the --default flag to enabled and introducing an --eu shorthand for setting the region to EU.

• Flipped --default flag to default to true and set region default to us
• Introduced a new --eu boolean flag and applied override logic in handlers
• Updated tests to cover the new flags and enhanced README with MCP commands and revised options table

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/tests/cli.test.ts	Added tests for --default, --eu, and updated region behavior
bin.ts	Changed default values, added --eu option, updated handlers
README.md	Added “MCP Commands” section and updated CLI options table

Comments suppressed due to low confidence (2)

src/tests/cli.test.ts:184

• Currently tests only cover mcp add. Add tests for mcp remove (e.g., respecting --eu, default region, and global flags) to ensure both commands behave consistently.

  describe('mcp commands', () => {

bin.ts:102

• The mcp remove handler doesn’t apply the --eu override like mcp add does. Mirror the logic: copy argv into an options object, check argv.eu, set options.region = 'eu' if true, then call runMCPRemove(options…).

          );