Add comment documenting readState limitation for multi-root workspaces

Added a comment to readState noting that it currently only supports the
first workspace folder, and that it should accept a repositoryUri parameter
if multi-root support is needed in the future.

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

src/common/temporaryState.ts

@@ -82,6 +82,9 @@ export class TemporaryState extends vscode.Disposable {
 
 	private async readState(subpath: string, filename: string): Promise<Uint8Array> {
 		let filePath: vscode.Uri = this.path;
+		// Note: readState currently only supports the first workspace folder
+		// If this method is needed for multi-root workspace support in the future,
+		// it should accept a repositoryUri parameter like writeState does
 		const workspace = (vscode.workspace.workspaceFolders && vscode.workspace.workspaceFolders.length > 0)
 			? vscode.workspace.workspaceFolders[0].name : undefined;