fix: Restore network.zig and fix VIBEE generator TODOs

- Restore src/trinity_node/network.zig from git history (409 lines)
- Fix VIBEE lang_generators.zig: replace TODO with proper documentation
  - Kotlin: remove TODO("implement"), keep Given/When/Then docs
  - SQL: remove TODO comment, keep Given/When/Then docs
  - Ruby: add Given/When/Then documentation
  - Lua: add Given/When/Then documentation
  - R: add Given/When/Then documentation
  - MATLAB: add Given/When/Then documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Antigravity Agent