chore: bump version to 6.1.3

- Update README version badge and release notes
- Published to npm with simplified edit_file CLI

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-code-workflow",
-  "version": "6.1.2",
+  "version": "6.1.3",
   "description": "JSON-driven multi-agent development framework with intelligent CLI orchestration (Gemini/Qwen/Codex), context-first architecture, and automated workflow execution",
   "type": "module",
   "main": "ccw/src/index.js",