Refactor package.json Build Entrypoints

[ZFordDev]

Summary

Clean up package.json so it only contains entrypoints that call the new multi‑script system.

Tasks

• Replace old scripts with:
  • build:dev
  • build:test
  • release
  • pack
  • build:linux
• Remove legacy logic
• Ensure compatibility with package.json Build Section Cleanup #120
• Prepare for documentation updates (Documentation Overhaul (Build + Updater) #122)

Branch

issue/115-build-system-modernisation → issue/119-build-script-redesign