chore: update gitignore for IDE support

- Add .zed/ to gitignore (Zed editor config)
- Add .opencode/ to gitignore (opencode tool data)
- Remove .zed/settings.json from version control
- Keeps repository clean of IDE-specific files

.gitignore

@@ -53,7 +53,9 @@ coverage.html
 
 # IDE
 .idea/
+.zed/
 .vscode/
+.opencode/
 *.iml
 .DS_Store
 Thumbs.db