Add Nodepod - browser-native Node.js runtime for AI agents

[R1ck404]

Summary

• Adds Nodepod to the list — a browser-native Node.js runtime that enables AI agents to execute real Node.js code entirely in the browser
• Provides sandboxed code execution with in-memory filesystem, npm package installation, shell interpreter, and full Node.js polyfills — no server infrastructure needed
• Positioned alphabetically between LangSmith and SID