Package as an installable scoped npm CLI: @devroy10/html-to-pdf

[devroy10]

Parent: #1

Goal
Package this repository as an installable npm CLI so users can install globally (or use npx) and convert HTML to PDF from the command line.

Acceptance criteria

• package.json includes a bin entry exposing a CLI command (e.g. html-to-pdf).
• The CLI accepts input (URL or local HTML file) and output path arguments.
• Basic CLI help/usage printed with -h/--help.
• Cross-platform executable (shebang + proper permissions) and tested locally.
• README updated with install and usage examples (npm i -g and npx).
• CI workflow added to build/test and publish to npm on release (optional: GitHub Actions).
• Version bumped and package name chosen/published using a scoped name (@devroy10/html-to-pdf).
• Unit/integration tests for CLI parsing and core behavior.

Tasks

• Add bin entry in package.json.
• Implement CLI entrypoint (parse args, call existing library functions).
• Add usage/help text and exit codes.
• Update README with install/usage.
• Add simple tests for CLI.
• Add GitHub Actions workflow to test and optionally publish on tag.
• Publish initial version with package name @devroy10/html-to-pdf.

Notes

• Use scoped npm package name: @devroy10/html-to-pdf.

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