Update installation docs for local build

Replace npm install instructions with local clone/build steps
since the package is not published to npm.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -14,14 +14,20 @@ A CLI tool that generates Ralph Method project scaffolds with AI-powered researc
 
 ## Installation
 
+Clone and build locally:
+
 ```bash
-npm install -g ralph-vibe
+git clone <repo-url>
+cd ralph-gen
+npm install
+npm run build
+npm link
 ```
 
-Or with npx (no installation required):
+Or run directly:
 
 ```bash
-npx ralph-vibe --help
+./dist/index.js --help
 ```
 
 ## Quick Start