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Explain how something works in this codebase by exploring code and producing a clear architectural explanation. Optionally critique the architecture for issues.

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# How

Explore the codebase to answer "how does X work?" questions. Produce clear architectural explanations at the level of a senior engineer onboarding onto a subsystem — enough to build a working mental model, not so much that it reads like annotated source code.

Two modes:

1. **Explain** (default) — explore the codebase and produce a clear explanation
2. **Critique** — explain first, then spawn multiple models to independently identify architectural issues

## Explain Mode

### Step 1 — Understand the Question and Assess Complexity

Parse what the user is asking about. They might say: