Multi module version management tool

[sonnes]

Summary

• Add changeset CLI tool for managing versioning and releases in multi-module Go repositories
• Inspired by changesets for JavaScript monorepos

Commands

Command	Description
changeset init	Sets up the .changeset folder with config and README
changeset add	Create a changeset to document changes
changeset status	Show pending changesets and computed version bumps
changeset version	Consume changesets, update go.mod files, and generate changelogs
changeset publish	Create git tags and push to origin
changeset tag	Create git tags without pushing

Workflow

1. Development: Run changeset add to document changes alongside code
2. Code Review: Reviewers see changeset files in PRs describing bump types and summaries
3. Accumulation: Changesets accumulate on main branch until release
4. Release: Run changeset version to update versions and changelogs, then changeset publish to create tags

Test plan

• Unit tests for changeset parsing and version computation
• Unit tests for module graph and dependency resolution
• Unit tests for git tag operations
• Manual testing of full workflow

[codecov-commenter]

Codecov Report

❌ Patch coverage is 18.21403% with 1154 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.18%. Comparing base (a822a9d) to head (e216114).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/changeset/app/status.go	0.00%	158 Missing ⚠️
cmd/changeset/app/add.go	0.00%	135 Missing ⚠️
cmd/changeset/app/cli.go	0.00%	131 Missing ⚠️
cmd/changeset/git/git.go	0.00%	124 Missing ⚠️
cmd/changeset/app/version.go	0.00%	102 Missing ⚠️
cmd/changeset/changeset/changelog.go	31.93%	80 Missing and 1 partial ⚠️
cmd/changeset/testutil/testutil.go	0.00%	74 Missing ⚠️
cmd/changeset/testutil/cli.go	0.00%	61 Missing ⚠️
cmd/changeset/app/publish.go	0.00%	41 Missing ⚠️
cmd/changeset/changeset/version.go	34.92%	41 Missing ⚠️
... and 10 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #63       +/-   ##
===========================================
- Coverage   84.15%   59.18%   -24.97%     
===========================================
  Files          60       81       +21     
  Lines        2316     3727     +1411     
===========================================
+ Hits         1949     2206      +257     
- Misses        353     1490     +1137     
- Partials       14       31       +17     

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