Standardize --version output with Go and platform metadata

[Copilot]

Summary

• Update --version output to include runtime metadata in the format projectName version vX.Y.Z (goX.Y, os/arch)
• Keep existing CLI behavior unchanged; only adjust version string formatting
• Add a formatter helper that normalizes semver (v prefix for bare X.Y.Z) and appends runtime.Version(), runtime.GOOS, and runtime.GOARCH
• Add unit tests covering semver normalization and non-semver passthrough behavior

Validation

• go build ./...
• go clean -testcache && go test ./...
• Parallel validation: Code Review + CodeQL
  • CodeQL: 0 alerts
  • Code Review: one non-blocking suggestion about regex placement/comments left as-is to preserve the requested targeted logic and structure