A flavored build (commit, canary, preview channel) copies its icons over the
committed apps/desktop/assets before packaging. write-build-stamp ran after
that copy, so its git check saw modified tracked files and stamped the
bundle dirty, and the Windows smoke refused it (stamp.dirty: true != false),
which keeps a channel from promoting the build. Stamp first, in both the CI
driver (scripts/bundles/desktop.py) and the source build (build.mjs). The
stamp reads no artwork, so its content is unchanged.
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