test: add unit tests for getRepoName with various git URL formats

[timvw]

Summary

• Add TestGetRepoName: validates the function works in current repository context
• Add TestExtractRepoNameFromURL: comprehensive test with 22 test cases covering various git URL formats
• Test coverage includes GitHub, GitLab, Bitbucket, Azure DevOps, and self-hosted git URLs
• Tests both HTTPS and SSH URL formats
• Tests URLs with and without .git suffix
• Tests edge cases like trailing slashes, special characters, and multiple .git occurrences

Test plan

• All tests pass locally (go test -v)
• Wait for CI checks to pass

Resolves beads-oss-tasks-f4a

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.72%. Comparing base (ce04bd4) to head (387bffa).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   18.09%   19.72%   +1.62%     
==========================================
  Files           1        1              
  Lines         431      431              
==========================================
+ Hits           78       85       +7     
+ Misses        348      341       -7     
  Partials        5        5              

see 1 file with indirect coverage changes

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