fix:run-multimodtag-cmd-multipletimes

[AnubhavPurohit691]

Resolves #205

Make multimod tag idempotent for tags on the same commit

Summary

Enhances multimod tag to skip tags that already exist on the specified commit, allowing the command to be re-run safely. This enables dry-run git push workflows using --print-tags output.

Changes

• Added commit-aware tag checking: distinguishes between tags on same commit vs. different commits
• Skip existing tags on target commit (no error)
• Still error if tags exist on different commit (safety check)
• Updated tests to reflect new behavior

results

• ✅ Idempotent: safe to re-run on same commit
• ✅ Enables dry-run workflows: multimod tag --print-tags | xargs git push --dry-run
• ✅ Backward compatible: all existing tests pass

Testing

All tests pass, including new test for tags on different commits.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: AnubhavPurohit691 / name: Anubhav Purohit (f23cc0b)

[codecov]

Codecov Report

❌ Patch coverage is 78.12500% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.49%. Comparing base (660858d) to head (f23cc0b).

Files with missing lines	Patch %	Lines
multimod/internal/tag/tag.go	78.12%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1539      +/-   ##
==========================================
+ Coverage   63.43%   63.49%   +0.05%     
==========================================
  Files          66       66              
  Lines        3397     3427      +30     
==========================================
+ Hits         2155     2176      +21     
- Misses       1006     1012       +6     
- Partials      236      239       +3     

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