WIP: Improved them checker readability, and modernized syntax

[ibalosh]

what

• Removed lodash usage from checker.js, replace with ES6+ syntax
• Extracted helper functions for readability
• Read origPath from returned object instead of relying on input mutation
• Added try/finally to ensure cleanup on errors
• Added tests for cleanup behavior (including nested zips)

Why

• Improves readability, makes data flow explicit, ensures cleanup on errors.

[coderabbitai]

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