docs: add LuaJIT requirement

Fixes #227 by documenting that Neovim must be built with LuaJIT.
The plugin uses goto statements which are LuaJIT-specific.

Author: ravitemer

doc/installation.md

@@ -4,7 +4,7 @@ Please read the [getting started](/index) guide before reading this.
 
 ## Requirements
 
-- Neovim >= 0.8.0
+- Neovim >= 0.8.0 (built with LuaJIT)
 - Node.js >= 18.0.0
 - [plenary.nvim](https://github.com/nvim-lua/plenary.nvim)
 - [mcp-hub](https://github.com/ravitemer/mcp-hub) (automatically installed via build command)

doc/other/troubleshooting.md

@@ -24,6 +24,7 @@ Run `:checkhealth mcphub` in Neovim to check for common issues
  uvx --version    # Should be installed
  ```
 - Most server commands use `npx` or `uvx` - verify these work in your terminal
+- Neovim must be built with LuaJIT (not PUC Lua 5.1)
 
 ## Configuration File