fix(pi): converge worker failures and thinking state

tests/unit/pi-extension-host.test.ts

@@ -269,6 +269,49 @@ describe('managed Pi extension bridge', () => {
     expect(currentWorker.status).toBe(200);
   });
 
+  it('releases a crashed worker write lease so only its same-project waiter advances', async () => {
+    const root = await mkdtemp(path.join(tmpdir(), 'makelore-pi-extension-crash-lease-'));
+    roots.push(root);
+    const leases = new PiProjectWriteLeaseCoordinator();
+    const host = new PiManagedExtensionHost(leases);
+    hosts.push(host);
+    const crashed = await host.registerWorker({
+      conversationId: 'conversation-crashed', generation: 1, projectId: 'project-a', extensionsDir: root,
+    });
+    const waiter = await host.registerWorker({
+      conversationId: 'conversation-waiter', generation: 1, projectId: 'project-a', extensionsDir: root,
+    });
+    const other = await host.registerWorker({
+      conversationId: 'conversation-other', generation: 1, projectId: 'project-b', extensionsDir: root,
+    });
+    await Promise.all([
+      host.bindRun('conversation-crashed', 1, 'run-crashed'),
+      host.bindRun('conversation-waiter', 1, 'run-waiter'),
+      host.bindRun('conversation-other', 1, 'run-other'),
+    ]);
+    expect((await post(crashed, {
+      action: 'lease.acquire', conversationId: 'conversation-crashed', workerGeneration: 1,
+      runId: 'run-crashed', resourceId: 'crashed-write',
+    })).status).toBe(200);
+    const waiting = post(waiter, {
+      action: 'lease.acquire', conversationId: 'conversation-waiter', workerGeneration: 1,
+      runId: 'run-waiter', resourceId: 'waiting-write',
+    });
+    expect((await post(other, {
+      action: 'lease.acquire', conversationId: 'conversation-other', workerGeneration: 1,
+      runId: 'run-other', resourceId: 'other-write',
+    })).status).toBe(200);
+    await expect.poll(() => leases.waitingCount('project-a')).toBe(1);
+
+    await crashed.dispose();
+
+    await expect(waiting).resolves.toMatchObject({ status: 200 });
+    expect(leases.waitingCount()).toBe(0);
+    expect(leases.activeCount).toBe(2);
+    await Promise.all([waiter.dispose(), other.dispose()]);
+    expect(leases.activeCount).toBe(0);
+  });
+
   it('joins a coding child to the same project write lease as its parent', async () => {
     const root = await mkdtemp(path.join(tmpdir(), 'makelore-pi-extension-child-lease-'));
     roots.push(root);