feat(ralph): v1.2.0 - Copy templates from plugin instead of generating

Convert now finds the plugin location and copies prompt.md and ralph.sh
directly from templates/, ensuring consistency across projects and
automatic sync when running /ralph:convert again.

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

.claude-plugin/marketplace.json

@@ -18,7 +18,7 @@
       "name": "ralph",
       "source": "./plugins/ralph",
       "description": "Autonomous loop for PRD implementation - context detection, adaptive questions, browser verification",
-      "version": "1.1.0",
+      "version": "1.2.0",
       "keywords": ["ralph", "prd", "autonomous", "agent", "loop", "browser", "verification"]
     }
   ]