chore: bump version to alpha.14

- Updated CHANGELOG.md with comprehensive Alpha.14 release notes
- Added advanced builder features and custom installation improvements
- IDE configuration preservation during upgrades
- Breaking change: removed legacy agent-install command

package.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://json.schemastore.org/package.json",
   "name": "bmad-method",
-  "version": "6.0.0-alpha.13",
+  "version": "6.0.0-alpha.14",
   "description": "Breakthrough Method of Agile AI-driven Development",
   "keywords": [
     "agile",