Challenge 2: Write a Mongoose Schema — Possible Solution
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const mongoose = require("mongoose");

const taskSchema = new mongoose.Schema({
  title: { type: String, required: true },
  done: { type: Boolean, default: false }
});

const Task = mongoose.model("Task", taskSchema);

WHY THIS WORKS AS AN ANSWER
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Each requirement from the challenge maps directly onto Mongoose's
schema field options, the same pattern the chapter's own Product
example used:
  - title: { type: String, required: true } makes title mandatory —
    attempting to create a Task without one would fail validation,
    the same enforcement idea as $jsonSchema's "required" array from
    Chapter 6, just expressed at the application layer instead of the
    database layer.
  - done: { type: Boolean, default: false } both constrains the
    field's type AND supplies a default value when none is given —
    creating a task without specifying "done" at all results in
    done: false automatically, a convenience the raw native driver
    doesn't provide on its own.

mongoose.model("Task", taskSchema) then registers this schema as a
usable model, the same way the chapter's example turned productSchema
into a working Product model that could call .create().