🧪 Test parseMetadataYaml in generate-manifest.js

[akutuva21]

🎯 What: The parseMetadataYaml parser function in scripts/generate-manifest.js was missing unit tests. Testing is crucial for this duplicated parsing logic to prevent regressions during future maintenance.
📊 Coverage: The function is now fully tested in scripts/generate-manifest.test.js, covering all primary behaviors: basic key-value pair parsing, ignoring empty lines and comments, parsing list arrays (like 'tags'), parsing simple and deeply nested objects, and handling empty array representations.
✨ Result: Test coverage for generate-manifest.js has significantly improved, providing a safety net that allows confident refactoring.

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PR created automatically by Jules for task 959060263818870501 started by @akutuva21

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