fix: harden queue retry debounce and add regression tests

src/agents/pi-embedded-runner/run/attempt.test.ts

@@ -1,7 +1,11 @@
 import type { AgentMessage } from "@mariozechner/pi-agent-core";
 import type { ImageContent } from "@mariozechner/pi-ai";
 import { describe, expect, it, vi } from "vitest";
-import { injectHistoryImagesIntoMessages, resolvePromptBuildHookResult } from "./attempt.js";
+import {
+  injectHistoryImagesIntoMessages,
+  resolvePromptBuildHookResult,
+  resolvePromptModeForSession,
+} from "./attempt.js";
 
 describe("injectHistoryImagesIntoMessages", () => {
   const image: ImageContent = { type: "image", data: "abc", mimeType: "image/png" };
@@ -103,3 +107,14 @@ describe("resolvePromptBuildHookResult", () => {
     expect(result.prependContext).toBe("from-hook");
   });
 });
+
+describe("resolvePromptModeForSession", () => {
+  it("uses minimal mode for subagent sessions", () => {
+    expect(resolvePromptModeForSession("agent:main:subagent:child")).toBe("minimal");
+  });
+
+  it("uses full mode for cron sessions", () => {
+    expect(resolvePromptModeForSession("agent:main:cron:job-1")).toBe("full");
+    expect(resolvePromptModeForSession("agent:main:cron:job-1:run:run-abc")).toBe("full");
+  });
+});