Add PUT /users/:id (update a user)

[emcconde2]

Summary

• Add updateUser(id, { name, email }) to db/store.js, following the existing createUser/getUserById pattern.
• Add PUT /users/:id to routes/users.js: validates name/email (400 if missing), returns 404 for an unknown id, 200 with the updated user otherwise.
• Add NOTES.md documenting the plan, model choice, commit split, and self-review findings.

Why

Implements the "update a user" endpoint required by the course project, going through the existing db/store.js data-access pattern rather than touching data directly in the route.

Test plan

• npm test is green (9/9), including the pre-written tests/update-user.test.js
• PUT /users/:id with a valid body updates the user and returns 200
• PUT /users/9999 (unknown id) returns 404
• PUT /users/:id with a missing field returns 400
• NOTES.md present with real content

[mateacademy-ai-mentor]

Review Summary

Your implementation is approved. The db/store.js correctly implements the updateUser helper with proper user lookup via getUserById, undefined return for missing users, and in-place mutation. The routes/users.js endpoint properly handles PUT requests with id-parsing, input validation (400 for missing fields), 404 for unknown ids, and 200 responses with the updated user. The NOTES.md documents your plan, model choice, commit strategy, and self-review findings with appropriate specifics. All three files have been reviewed and meet the task requirements.

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