Add Cursor plugin support alongside Claude Code plugins

[masnwilliams]

Summary

Add Cursor plugin support to kernel/skills so this repo serves both Claude Code and Cursor marketplaces.

Added files:

• .cursor-plugin/plugin.json — Cursor marketplace manifest pointing to existing skills via ["./plugins/kernel-cli/skills/", "./plugins/kernel-sdks/skills/"]
• mcp.json — MCP server config for Kernel cloud browser tools
• rules/kernel-best-practices.mdc — best practices for browser automation
• assets/logo.png — Kernel logo for the Cursor marketplace listing
• Updated README.md with Cursor installation instructions

Not changed: All existing Claude Code plugin structure (.claude-plugin/, plugin dirs, skills, references, examples) is untouched.

Test plan

• Verify Claude Code plugins still work (/plugin marketplace add kernel/skills)
• Verify .cursor-plugin/plugin.json is valid for Cursor marketplace
• Install in Cursor and confirm all 6 skills are discovered from the two plugin skill dirs
• Confirm MCP server config and rules load in Cursor

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Note

Low Risk
Adds new metadata/config files for Cursor marketplace distribution and documentation updates, without changing existing skill implementations or runtime logic.

Overview
Adds Cursor marketplace support by introducing a new .cursor-plugin/plugin.json manifest that points Cursor at the existing Kernel skill directories and bundled rules/.

Includes a default mcp.json that registers the hosted Kernel MCP server, and adds rules/kernel-best-practices.mdc for browser automation guidance. Updates README.md with Cursor installation instructions.

^{Written by Cursor Bugbot for commit 6e3347b. This will update automatically on new commits. Configure here.}