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[zsweiter]

Summary:
This PR includes updates to the project that improve the JSON5 support, enhance safety for execution actions, and clean up unused code. It also adjusts the Git workflow to only run tests on merged code and builds/releases only on release events.

Changes included:

• Updated versioning and download scripts.
• Removed nightly Rust configuration.
• Added support for JSON5 format in plugin manifests.
• Removed unused HTTP client code.
• Prevented execution of actions when the working directory is unsafe.
• Updated code with new JSON5 implementation and pre-command support.

Workflow improvements:

• Tests and lints now run on merged code to avoid running on every push.
• Build and release pipeline is triggered only on GitHub release publication.

Impact:

• Safer execution of scripts.
• Clean and maintainable codebase.
• GitHub Actions now follow a clear CI/CD separation.