Replace all exec.Command("git", ...), initGitRepo, runGitInDir, and
newTestGitClientWithUpstream with run.Stub()/run.CommandStubber stubs.
Changes:
- Remove os/exec and strings imports; add fmt, regexp, internal/run
- Add newTestGitClient(), stubGitRemote(), stubEnsurePushed() helpers
- Remove initGitRepo, runGitInDir, newTestGitClientWithUpstream helpers
- Add cmdStubs field to TestPublishRun table struct
- Convert all test cases to use stub-based git interactions
- Use regexp.QuoteMeta for remote name patterns
- Use %[1]s/%[2]s format args in stubGitRemote
- Initialize git.Client with explicit GitPath to avoid real git resolution
- Rewrite TestEnsurePushed with stub-based tests
- Update TestDetectGitHubRemote_UsesDir and TestPublishRun_DirArgUsesTargetRemote
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
5ae5d1db7f