test_tools 0.19.1

Tools for writing and running tests.
Documentation 
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# Pattern Doc Entity

### Scope

- **Purpose**: Documents reusable design patterns applied in `test_tools`.
- **Responsibility**: Index of all pattern doc instances with problem/solution/applicability.
- **In Scope**: Structural and architectural patterns used in the implementation.
- **Out of Scope**: Behavioral invariants; see `docs/invariant/`.

### Overview Table

| ID  | Name | Purpose | Status |
|-----|------|---------|--------|
| 001 | [Namespace Layers](001_namespace_layers.md) | Four-layer module hierarchy for graduated API visibility | ✅ |