Bump commander from 12.1.0 to 15.0.0 and add CLI flag compatibility tests

[dependabot]

Bumps commander from 12.1.0 to 15.0.0.

Also adds automated CLI compatibility coverage to ensure existing flags continue to parse as expected with commander 15:

• Added src/flags.test.ts to validate help output and parsing for all defined flags (--endpoint/-e, --color/-c, --title/-T, --text/-x)
• Updated scripts so npm test runs the new flag compatibility test suite via test:flags

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[donatj]

@copilot can you do some testing ensure that all our flags as defined continue to parse in commander 15 as they do in 12? You will probably want to lift them into a test script to test.

I have had trouble with this package breaking in the past so I am hesitant to upgrade.

[Copilot]

@copilot can you do some testing ensure that all our flags as defined continue to parse in commander 15 as they do in 12? You will probably want to lift them into a test script to test.

I have had ...

Implemented in commits 26a66a4, ea4f2a6, and 8740555. I added src/flags.test.ts to exercise the CLI’s defined flags (--endpoint/-e, --color/-c, --title/-T, --text/-x) and verify both help output and long/short flag parsing behavior with commander 15. npm test now runs this compatibility test (npm run test:flags), and it passes.