Paste one or more rules in markdown format. Expected format:

### `SEC001`

- **Severity:** critical
- **Category:** security
- **Rule:** Description of the rule.
- **Reasoning:** Why this rule exists.

### `PERF001`

- **Severity:** high
- **Category:** performance
- **Rule:** Another rule description.
- **Reasoning:** Why this matters.

Categories: security, best_practice, bug, performance, architectural, etc.