Integrate Api Client Task

Problem

A Ruby team needs help with a task in this area:

Use when integrating with external APIs in Ruby using a strict 5-layer pattern: Auth → Client → Fetcher → Builder → Entity — each layer test-gated (spec RED → impl GREEN before next layer), Auth has self.default + DEFAULT_TIMEOUT + cached #token, Client wraps HTTP with nested Error + MISSING_CONFIGURATION_ERROR + injected adapter (errors exclude raw response bodies), Fetcher uses initialize(client, data_builder:, default_query:) with MAX_RETRIES + RETRY_DELAY_IN_SECONDS, Builder allowlists ATTRIBUTES and drops instruction-like keys (prompt, system, etc), Entity defines ATTRIBUTES + DEFAULT_QUERY + .find/.search — specs use synthetic hash factories only, vendor responses are untrusted (prompt injection guard, no URL ingest, no browsing), and changes Ruby source and specs only.

The team has asked for a concise implementation artifact that a reviewer can inspect without needing to observe the agent's process.

Output

Create answer.md with:

• a short plan for the work
• the concrete Ruby-oriented artifact or recommendation
• the verification steps or quality gates that should be run
• any assumptions that affect the result