Refactor/Modernize code

[RyanZim]

• Use top-level await
• Use async functions where there's distinct advantages
• Use node: prefix consistently
• Cleanup some unneeded code

[Copilot]

Pull request overview

Modernizes the CLI’s asynchronous flow and standardizes Node.js built-in imports.

Changes:

• Replaces Promise chains with top-level await and async functions.
• Standardizes built-in imports using node: prefixes.
• Removes redundant input normalization and error propagation code.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
index.js	Modernizes CLI execution and processing flow.
lib/DependencyGraph.js	Updates path import.
lib/DependencyGraph.test.js	Updates path import.
lib/getMapfile.js	Updates path import.
test/base.js	Updates path import.
test/config.js	Updates path import.
test/dir.js	Updates path import.
test/ext.js	Updates path import.
test/glob.js	Updates path import.
test/helpers/cli.js	Updates Node built-in imports.
test/helpers/env.js	Updates path import.
test/helpers/tmp.js	Updates path import.
test/replace.js	Updates path import.
test/stdin.js	Updates Node built-in imports.
test/stdout.js	Updates Node built-in imports.
test/watch.js	Updates Node built-in imports.

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