chore: Update Gemfile.lock to version 0.2.0

Fix CI failure caused by version mismatch between Gemfile.lock (0.1.9)
and .version file (0.2.0). This update ensures consistent versioning
across the project.

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

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

Author: nacyot

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    worktree_manager (0.1.9)
+    worktree_manager (0.2.0)
       thor (~> 1.0)
       tty-prompt (~> 0.23)