Document Folder APIs and add local Visit Examples.

Co-authored-by: Cursor <cursoragent@cursor.com>

defaultpath.go

@@ -9,7 +9,9 @@ import (
 
 // DefaultPathStore persists the Saved Default Working Folder path (User Files Root–relative).
 type DefaultPathStore interface {
+	// GetDefault returns the stored path, or empty when none is set yet.
 	GetDefault() (string, error)
+	// SetDefault writes a User Files Root–relative Working Folder path.
 	SetDefault(rel string) error
 }