Mixed-platform build trees sent stale artifacts in unbounded DIF assembles. Select shipped identities explicitly, bound uploads, and require native, Dart-map, source, and release phases to complete.
Verified the actual mixed-build Android release against a local Bugs server, 10 uploader tests, 39 release tests, and scoped Dart analysis. The repository-wide analyzer reports unrelated warnings in nested worktrees; the pre-commit hook is skipped for that known check failure.
scripts/ had ~80 flat files. Entry points (ci_*.sh, codegen.sh, run_tests.sh, format_native.sh, setup_hooks.sh, upload-symbols.*) and the shared pubspec_version.py stay at the root; checkers, generators, maestro tooling and release tooling move into subdirectories with their tests. Updated every reference: workflow steps, guard-test glob, Docker COPY paths and .dockerignore whitelist, website audit path, dart test imports, and regenerated the five outputs whose headers embed generator paths.
edde746