fix(index): ignore undefined options

[Fdawgs]

Checklist

• Run npm test
• Commit message adheres to the Conventional commits style, following the @commitlint/config-conventional config

[Copilot]

Pull request overview

Updates option parsing so explicitly undefined option values are treated as “not provided” (rather than invalid), aligning with the API expectation that all CLI options are optional and preventing unnecessary validation errors.

Changes:

• Skip option entries whose value is undefined during CLI arg generation.
• Add a regression test ensuring { outputHtml: undefined } behaves the same as omitting options (default HTML output).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/index.js	Updates parseOptions to ignore keys whose values are undefined, avoiding type/version validation for absent options.
test/index.test.js	Adds coverage for outputHtml: undefined to ensure default HTML behavior remains intact.

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