[ClausValcaTD]

Scaffold Chromium Embedded Framework (CEF) backend architecture under src/cef/ based on cefsimple reference and update binding.gyp to support conditional target compilation (adren_engine variable defaulting to 'webview'). Ensure 100% test pass rate on default build.

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PR created automatically by Jules for task 14937844134672085455 started by @ClausValcaTD

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