Add .worktrees/ to .gitignore

Prevent worktree contents from being tracked in repository.

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

Co-Authored-By: Claude <[email protected]>

Author: edeno

.gitignore

@@ -156,3 +156,6 @@ _version.py
 *.npz
 *.pkl
 *.png
+
+# Git worktrees
+.worktrees/