feat: transform module globals before compiling with tsc.

[knightedcodemonkey]

• update docs.
• upgrade specifier dependency.
• closes #42
• works around https://github.com/microsoft/TypeScript/issues/58658

BREAKING CHANGE:

• removes --parallel option.
• upgrades supported node versions >= 20.11.0.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.00000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 98.18%. Comparing base (aa9980d) to head (9c45dc1).

Files	Patch %	Lines
src/duel.js	94.25%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #44 +/- ## ========================================== + Coverage 96.46% 98.18% +1.71% ========================================== Files 3 3 Lines 453 385 -68 ========================================== - Hits 437 378 -59 + Misses 16 7 -9 ```

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