Adds Slime — turns a real Claude Code session into a turn-based RPG: a statusline HUD + a PixiJS battle arena where goals are bosses, todos are minions, and the token budget is your resource.

• Pure observer, driven by hooks — zero impact on the session, zero runtime dependencies, MIT
• XP/levels/badges/quests/loot/prestige, weekly shareable Wrapped card, en+zh
• Live demo (no install): https://slime-arena-demo.shuangqu.workers.dev
• Install: /plugin marketplace add bitqs/slime → /plugin install slime@slime

One bullet added under Developer Productivity, matching the existing format.