The 2026-07-08 public-release history scrub (0f1143a) rewrote history
and dropped `git rev-list --count` below the build number already
shipped to testers (298), so post-scrub builds (291, 294) read as
downgrades. Add a floor offset so versionCode clears 298 and stays
monotonic across the rewrite: the current count maps to 300, and each
later commit still increments by one.