Extract readFromGitRef helper function to eliminate duplicate code for
running git show <ref>:<path> commands. The helper is now used by:
- checkGitForIssues() in autoimport.go
- importFromGit() in autoimport.go
- readFirstIssueFromGit() in init.go
The scanning/parsing logic is intentionally kept separate since each
function has different requirements (error handling, SetDefaults, etc).
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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