Merge mcp-port skill into mcp-codegen as a reference file

Split monolithic skill into 4 independent skills

Add MIT LICENSE file

Restructure plugin: split monolithic files into focused references

Expand MCP server pattern coverage to 15 types across 4 tiers

Always generate TypeScript/npm CLI regardless of source language

Fix installation instructions to use git clone

Fix plugin.json repository URL, simplify README header

Initial commit: mcp2cli Claude Code plugin