fix(build): match only semver tags in git_version()

[Ai-chan-0411]

Summary

• Fix git_version() in build.rs to use --match "v[0-9]*" instead of --match "v*" so that non-version tags like vm-dev are excluded from git describe output

Closes #832

Root cause

git describe --tags --long --match "v*" matches both v0.0.28 and vm-dev since both start with v. When vm-dev is on a more recent commit, git picks it, resulting in the version string m-dev after the v prefix is stripped.

Fix

Change the glob pattern from v* to v[0-9]* so only tags that start with v followed by a digit (i.e. semantic version tags like v0.0.28) are matched.

Test plan

• Verify git describe --tags --long --match "v[0-9]*" skips vm-dev and returns the correct semver tag
• Build locally and confirm openshell --version shows the expected version

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