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The flutter tool will now download and use an `engine_stamp.json` file to determine the engine version, content hash, build date, and commit date. The file is treated as a new `DevelopmentArtifact.informative` and is fetched before flutterVersion is used. This ensures we have build information for a clean checkout with no bin/cache folder. Users that download from flutter.dev will have engine_stamp.json, so its a no-op. This change provides support for content hashed engine artifacts, who's revision (the hash) is not a git commit sha. A side benefit is "git" is only used at build time to extract this information. > [!NOTE] > Content hashed artifacts are not enabled yet for downloads; bin/internal/engine.version (releases) and the shell updaters still look for the git commit sha. One can test this out by setting `FLUTTER_PREBUILD_ENGINE_VERSION` to the content hash.