Add cc-hud statusline plugin

[WaterTian]

Summary

Add cc-hud to the Development Engineering section.

cc-hud is a compact single-line statusline plugin for Claude Code that displays:

• Model name
• Context window usage (1/8 precision progress bar)
• Active subagents
• Rate limits (5h / 7d)

Built with pure Node.js, zero external dependencies, Catppuccin Mocha color theme.

• GitHub: https://github.com/WaterTian/cc-hud
• npm: cc-hud
• License: MIT
• Install: /plugin marketplace add WaterTian/cc-hud && /plugin install cc-hud && /cc-hud:setup