Summary

Adds a tinyfish-mcp skill so Codex can drive the TinyFish MCP server.

What TinyFish is: TinyFish gives agents tools to interface with the web, including:

• Search — ranked web search results for a query (titles, snippets, URLs).
• Fetch — render a URL in a real browser and return clean, structured page content.
• Agent — give it a URL and a natural-language goal, and it drives a real browser to click, fill forms, and walk multi-step flows. Supports stealth/anti-bot profiles.
• Browser — a remote stealth Chrome session for direct Playwright/Puppeteer/CDP control.

The MCP server at https://agent.tinyfish.ai/mcp exposes these to MCP-compatible assistants over OAuth 2.1 — no API key juggling.

What this PR adds:

• tinyfish-mcp/SKILL.md — prerequisites (one-line npx install-mcp ... --client codex, manual JSON fallback), the full tool catalog (search, fetch_content, run_web_automation, batch_*, create_browser_session, etc.), usage patterns, practical rules (including browser_profile: "stealth" for bot-protected sites), and common pitfalls.
• Lists the skill in the Data & Analysis section of the README alongside helium-mcp.