⚡ Bolt: Optimize globals scope tracking lookup

[ericbfriday]

💡 What: Added a globalNames hash map to optimize the O(N) global variable presence check within attachScope.
🎯 Why: In luaparse.js, indexOfObject(globals, 'name', node.name) was executing sequentially on an array for every global identifier in a linear lookup when collecting scope, causing unnecessary overhead for larger source files.
📊 Impact: Transforms a linear O(N) lookup within the scope parsing process to a constant time O(1) hash map check, noticeably improving parsing performance for large scopes.
🔬 Measurement: Verified the improvement with npm run bench:luast alongside all tests via npm run test successfully.

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PR created automatically by Jules for task 6170070596600731658 started by @ericbfriday

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