Replace Claude-Code-specific framing with cross-runtime language so
the skill is recognized as installable by any skills-compatible agent
(Claude Code, Codex, Cursor, OpenClaw, Hermes, CodeBuddy, Workbuddy,
Gemini CLI, OpenCode, etc.).
- Swap Claude Code badge for Agent Skills + skills.sh + Multi-Runtime
- Rewrite Install section: one-line (npx skills add auto-detects),
manual per-runtime paths, and use-as-reference fallback
- Replace 'Then in Claude Code' with runtime-agnostic phrasing