fix: hoist $defs to the schema root for set_tasks

Refs like "#/$defs/AddTask" resolve from the document root, but
Type.Cyclic nested the $defs inside tasks.items, so the moonshot-flavored
gateway reported "$defs not found for reference". Hoist all $defs entries
to the parameter schema root and strip the synthetic $id that would change
fragment resolution. Update the regression test to pin the layout.

Bump version to 0.2.3.

tests/tools.test.ts

@@ -31,14 +31,18 @@ test("registers five focused tools without the old add_task alias", () => {
   assert.deepEqual(Object.keys(tools.get("get_task").parameters.properties), ["ids"]);
 });
 
-test("set_tasks schema uses #/$defs/ refs accepted by strict providers", () => {
+test("set_tasks schema hoists $defs to the root with #/$defs/ refs", () => {
   const { tools } = registeredTools();
-  const itemSchema = tools.get("set_tasks").parameters.properties.tasks.items;
-  // Every local $ref must be a URI reference; bare names ("AddTask") are
-  // rejected by moonshot-flavored schema validators (Console Go upstream).
+  const params = tools.get("set_tasks").parameters;
+  const itemSchema = params.properties.tasks.items;
+  // $defs must live at the document root: root-style refs resolve from there,
+  // and moonshot-flavored validators reject nested definitions (Console Go).
+  assert.ok(params.$defs.AddTask, "$defs hoisted to the parameter schema root");
+  assert.equal(itemSchema.$defs, undefined, "no $defs nested inside tasks items");
   assert.equal(itemSchema.$ref, "#/$defs/AddTask");
-  assert.equal(itemSchema.$defs.AddTask.properties.children.items.$ref, "#/$defs/AddTask");
-  const serialized = JSON.stringify(tools.get("set_tasks").parameters);
+  assert.equal(params.$defs.AddTask.properties.children.items.$ref, "#/$defs/AddTask");
+  assert.equal(params.$defs.AddTask.$id, undefined, "synthetic $id stripped");
+  const serialized = JSON.stringify(params);
   assert.ok(!/"\$ref":"(?!\#)/.test(serialized), "no bare $ref values remain");
 });