Treat debug-metadata.json as the final unified debug asset, not as an early intermediate dump. Generate it only after every JS sourcemap that will be shipped or uploaded has already been finalized, including main-thread debug-info remapping and any late processAssets code transforms. When one template contains multiple runtimes, store JS sourcemaps as a jsSourceMaps collection rather than a single top-level map, and keep sourceMapRelease attached to each JS asset entry instead of the document root because Slardar matches sourcemaps per emitted JS file. Keep uiSourceMap and bytecode debug payloads as sibling debug documents inside the unified container instead of overloading the standard sourcemap top-level shape.