add persisted pi workflow extension

extensions/pi-workflow/index.test.ts

@@ -0,0 +1,39 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import type {
+  ExtensionAPI,
+  ExtensionContext,
+} from "@earendil-works/pi-coding-agent";
+import { registerWorkflowRecovery } from "./index.ts";
+import type { ContextTransitionRuntime } from "./context-transition.ts";
+
+
+test("session startup invokes persisted Workflow recovery", async () => {
+  let sessionStart:
+    | ((event: { reason: string }, ctx: ExtensionContext) => Promise<void>)
+    | undefined;
+  const pi = {
+    on(event: string, handler: typeof sessionStart) {
+      if (event === "session_start") sessionStart = handler;
+    },
+  } as unknown as ExtensionAPI;
+  let recoveries = 0;
+  registerWorkflowRecovery(pi, {
+    store: {} as never,
+    engineForContext: async () =>
+      ({
+        async recover() {
+          recoveries++;
+          return [];
+        },
+      }) as never,
+  } as ContextTransitionRuntime);
+  assert.ok(sessionStart);
+  await sessionStart(
+    { reason: "startup" },
+    {
+      ui: { notify: () => {} },
+    } as unknown as ExtensionContext,
+  );
+  assert.equal(recoveries, 1);
+});