version_bump.php now checks two additional sources before bumping:
1. --min-version argument: workflow can pass the current stable version
so the bump is guaranteed to be above it
2. Auto-detect from git: scans commit messages and remote branch
manifests (origin/main, origin/rc) to find the highest version
released on any channel. If a higher version exists on another
branch, uses that as the base instead of the local manifest.
This prevents the scenario where dev builds at 02.44.xx while stable
is at 02.45.00 — the bump will now use 02.45.00 as the base and
produce 02.45.01-dev or 02.46.00-dev depending on bump type.