Summary

• Add version command to show version, commit, and build date
• Support -v and --version flags
• Create version package with build-time variables
• Update release workflow to inject version info via ldflags

Implementation

Following the pattern used in jsando/mpu:

• Version variables can be set at build time using ldflags
• Default to 'dev' version for local development
• Release builds automatically extract version from git tag

Testing

$ go run . version
jb version dev
 commit: none
 built: unknown

$ ./jb-test version  # built with ldflags
jb version 0.2.0-test
 commit: 78b9ac2
 built: 2025-06-29T23:08:36Z