feat: strengthen task workflow and compaction recovery

index.ts

@@ -1,5 +1,10 @@
 import type { ExtensionAPI, ExtensionContext } from "@earendil-works/pi-coding-agent";
 import { clearCurrentTask, reportCurrentTask } from "./src/herdr.ts";
+import {
+  COMPACTION_REMINDER,
+  COMPACTION_REMINDER_TYPE,
+  hasUnfinishedTasks,
+} from "./src/prompt.ts";
 import { TaskState } from "./src/state.ts";
 import { registerTaskTools } from "./src/tools.ts";
 import { clearTaskWidget, updateTaskWidget } from "./src/widget.ts";
@@ -23,6 +28,17 @@ export default function piTodoHerdr(pi: ExtensionAPI): void {
   pi.on("session_shutdown", async (event) => {
     if (event.reason === "quit") await clearCurrentTask();
   });
+  pi.on("session_compact", () => {
+    if (!hasUnfinishedTasks(state.list())) return;
+    pi.sendMessage(
+      {
+        customType: COMPACTION_REMINDER_TYPE,
+        content: COMPACTION_REMINDER,
+        display: false,
+      },
+      { deliverAs: "steer" },
+    );
+  });
 
   registerTaskTools(pi, state, refresh);