Extract shared spawn types into dedicated module

Author: ofriw

spawn/shared.ts

@@ -0,0 +1,34 @@
+export type ThinkingValue = "off" | "minimal" | "low" | "medium" | "high" | "xhigh";
+export type SpawnOutcome = "running" | "success" | "aborted" | "error";
+
+export type SpawnResultDetails = {
+	depth: number;
+	model: string;
+	thinking: ThinkingValue;
+	truncated: boolean;
+	outcome: SpawnOutcome;
+	stats?: Record<string, number>;
+	statsUnavailable?: boolean;
+};
+
+type AssistantMessageLike = {
+	role: string;
+	content?: { type: string; text?: string }[];
+};
+
+/**
+ * Returns all text blocks from the last assistant message, joined by newlines.
+ */
+export function getLastAssistantText(messages: AssistantMessageLike[]): string {
+	for (let i = messages.length - 1; i >= 0; i--) {
+		const msg = messages[i];
+		if (msg.role !== "assistant") continue;
+		const text = (msg.content ?? [])
+			.filter((block) => block.type === "text" && typeof block.text === "string")
+			.map((block) => block.text ?? "")
+			.join("\n")
+			.trim();
+		if (text) return text;
+	}
+	return "";
+}