feat: update --version output to include Go version and os/arch

[Copilot]

Summary

Updates the --version flag output to match the standardized format:

yamltecture version vX.Y.Z (goX.Y, os/arch)

Changes

• Added regexp, runtime, and strings imports to main.go
• Added buildVersionOutput helper that normalizes the version string (adds v prefix to bare semver) and appends the Go runtime version plus OS/architecture
• Updated the version print statement from fmt.Println("Version:", Version) to fmt.Printf("yamltecture version %s\n", buildVersionOutput(Version))
• Added three unit tests for buildVersionOutput covering: bare semver input, already-prefixed v input, and non-semver (dev) input

Reference

Follows the same pattern as UnitVectorY-Labs/hallucinateapi#40.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.29%. Comparing base (f9524ba) to head (0d9914c).

Files with missing lines	Patch %	Lines
main.go	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   77.17%   77.29%   +0.11%     
==========================================
  Files          14       14              
  Lines         999     1004       +5     
==========================================
+ Hits          771      776       +5     
  Misses        153      153              
  Partials       75       75              

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