When running `gt install --wrappers` in an existing Gas Town HQ,
the command now installs wrappers directly without requiring --force
or recreating the entire HQ structure.
Previously, `gt install --wrappers` would fail with "directory is
already a Gas Town HQ" unless --force was used, which would then
unnecessarily reinitialize the entire workspace.
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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