Add SkillKit as a unified install option across all supported agents

[rohitg00]

Came across this on X today, session-handoff and explain tackle a real problem (context loss between agent sessions is a daily pain point for anyone using more than one CLI). Wanted to flag [SkillKit](https://github.com/rohitg00/skillkit) as a possible addition to your install matrix.

Right now the README has five install paths: Claude marketplace, Codex plugin.json, OpenCode INSTALL.md, Cursor plugin.json, Gemini extension. SkillKit is a universal skills CLI (44+ agents supported) that could collapse that to one command with auto-detection of whichever agent the user is on.

What it'd look like for users:

# auto-detects agent and writes to the right config dir
npx skillkit install entireio/skills

# or explicit
npx skillkit install entireio/skills --agent codex
npx skillkit install entireio/skills --agent claude-code --agent cursor

Why it might be worth considering:

• One install step for all 5 currently supported agents
• Auto-detection means new users don't need to figure out which README section applies to them
• Future agents you don't document today (Windsurf, Goose, Amp, Copilot, Kilo, Roo, etc.) become reachable without per-agent install docs
• Runs alongside your existing plugin manifests, doesn't replace them

Happy to send a PR for (1) if there's interest.

Links:

• SkillKit: https://github.com/rohitg00/skillkit
• Docs: https://www.skillkit.sh/docs/commands
• npm: https://www.npmjs.com/package/skillkit