chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/coding-agent/test/utilities.ts

@@ -152,6 +152,20 @@ export function assistantMsg(text: string) {
 	};
 }
 
+/**
+ * Read a session JSONL file and return one label per record: the message role for
+ * message entries, otherwise the entry type (e.g. "session", "model_change").
+ */
+export function readSessionFileRoles(file: string): string[] {
+	return readFileSync(file, "utf-8")
+		.trim()
+		.split("\n")
+		.map((line) => {
+			const record = JSON.parse(line);
+			return record.message?.role ?? record.type;
+		});
+}
+
 /**
  * Options for creating a test session.
  */