Clarify Saved semantics as file-backed state

Agent-Logs-Url: https://github.com/PowerShell/PowerShellEditorServices/sessions/b2f2d9b7-95c7-413b-8a23-7845a964c98a

Co-authored-by: JustinGrote <15258962+JustinGrote@users.noreply.github.com>

Author: Copilot

src/PowerShellEditorServices/Extensions/EditorWorkspace.cs

@@ -26,7 +26,7 @@ internal EditorWorkspaceDocument(EditorWorkspace workspace, string path, bool sa
         public string Path { get; }
 
         /// <summary>
-        /// Gets whether the document is saved (has no unsaved changes).
+        /// Gets whether the document is backed by a saved file path (not in-memory).
         /// </summary>
         public bool Saved { get; }
 

src/PowerShellEditorServices/Extensions/IEditorOperations.cs

@@ -14,8 +14,14 @@ internal WorkspaceOpenDocument(string path, bool saved)
             Saved = saved;
         }
 
+        /// <summary>
+        /// Gets the path or URI of the open document.
+        /// </summary>
         public string Path { get; }
 
+        /// <summary>
+        /// Gets whether the document is backed by a saved file path (not in-memory).
+        /// </summary>
         public bool Saved { get; }
     }