Add CONTRIBUTING.md for testing, PR checks, and release-please flow; link from
README and AGENTS. Document envc bash sourcing (set -a, source <(...)) for YAML/INI.
Co-authored-by: Cursor <cursoragent@cursor.com>
- Updated AGENTS.md and README.md to clarify the automated release process using release-please and GoReleaser.
- Added a version command to the envc CLI to display build metadata.
- Included CI/CD details in README for better understanding of testing and release automation.