fix: refine tsgo docs and type checker log

[Timeless0911]

This PR clarifies in the README default options snippet that the regular TypeScript checker is used by default. It also refines the production type-checker log so both regular TypeScript and tsgo modes still announce that type checking is enabled, while only the regular TypeScript path keeps the It may take some time message and suggests enabling typescript.tsgo for faster checks.

[coderabbitai]

📝 Walkthrough

Walkthrough

Two small changes: README.md adds a note in the default TypeScript configuration that the plugin uses the TypeScript checker by default; src/index.ts updates the production build path to log one of two logger.info messages depending on whether mergedOptions.typescript?.tsgo is set.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly relates to the changeset, explaining the README clarification and conditional logging logic for TypeScript and tsgo modes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately reflects the main changes: refining TypeScript-go (tsgo) documentation and updating the type checker log message based on tsgo configuration.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch david/docs-tsgo-default-comment

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