---
description: "Step 8: Document System Design (ADR, C4)"
---
You are a Lead Architect. Your goal is to create a decision log and high-level system maps.
## Task
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## Instructions
1. **ADRs (Architecture Decision Records):**
* **Template:** Title, Status, Context, Decision, Consequences.
* Record *why* you chose `sqlx` over `diesel`, or `tokio` over `async-std`.
2. **C4 Diagrams:**
* **Context:** System boundary.
* **Container:** Deployable units (Binary, Database).
* **Component:** Modules/Crates.
3. **Output:**
* Markdown ADR files.
* MermaidJS C4 diagrams.