release: bunenv 1.0.0 stable release

[JacobCoffee]

🎉 bunenv 1.0.0 - Stable Release

This PR prepares bunenv for its first stable 1.0.0 release after successful validation in production (byte project).

📋 Changes

Version Bumps

• pyproject.toml: 0.1.0 → 1.0.0
• src/bunenv/__init__.py: bunenv_version = "1.0.0"

New Files

• CHANGELOG.md - Comprehensive release history following Keep a Changelog format
  • Documents all features added since 0.1.0
  • Real-world validation notes
  • Comparison with alternatives

Cleanup

• ❌ Removed testpypi index from pyproject.toml
• ❌ Removed publish-to-testpypi job from publish workflow
• ✅ Production-ready PyPI publishing only
• ✅ Added test-env/ to .gitignore

🚀 1.0.0 Highlights

GitHub Action (#7 - Merged)

✅ Official JacobCoffee/bunenv@v1 action
✅ One-line setup for CI/CD
✅ Automatic caching
✅ Cross-platform (Ubuntu, macOS, Windows)
✅ Complete documentation in ACTION.md

Documentation (#6 - Merged)

✅ Professional Sphinx docs with Shibuya theme
✅ Complete API reference
✅ User guides and tutorials
✅ Troubleshooting and migration guides
✅ Makefile targets for building docs

Testing & Quality

✅ 98%+ test coverage
✅ Cross-platform tests
✅ Python 3.10-3.13 support
✅ Modern tooling (ruff, ty, prek)
✅ Comprehensive CI/CD

Real-World Validation

✅ Successfully migrated byte project from nodeenv → bunenv
✅ byte PR #136 passed CI - Production ready
✅ Zero breaking changes
✅ Proven architecture

📊 What Makes 1.0 Stable?

• ✅ Feature Complete - All planned features implemented
• ✅ Well Tested - Comprehensive test suite with high coverage
• ✅ Documented - Professional documentation
• ✅ Cross-Platform - Validated on all major platforms
• ✅ Production Proven - Running in byte project
• ✅ GitHub Action - Easy CI/CD integration
• ✅ Zero Dependencies - Pure Python stdlib
• ✅ Backward Compatible - No breaking changes from 0.1.0

🔄 Breaking Changes

None! - bunenv 1.0.0 is fully backward compatible with 0.1.0.

📝 Release Checklist

• Version bumped in all files
• CHANGELOG.md created
• Test suite passing
• Documentation complete
• GitHub Action implemented
• Real-world validation (byte project)
• Testpypi references removed
• Ready for PyPI publish

🎯 Next Steps

After this PR is merged:

1. Create GitHub Release v1.0.0
2. Tag action as v1 for GitHub Marketplace
3. PyPI publish will trigger automatically
4. Announce 1.0 release
5. Update byte project to use bunenv@v1 action

🔗 Related

• byte migration PR: feat: migrate from nodeenv to bunenv for Bun environment management byte#136 (passed CI ✅)
• GitHub Action PR: feat: add bunenv GitHub Action for CI/CD workflows #7 (merged ✅)
• Documentation PR: feat: migrate to Shibuya theme and add Makefile for docs #6 (merged ✅)

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