# Pattern Doc Entity
### Scope
- **Purpose**: Document architectural patterns applied in the claude_version design.
- **Responsibility**: Index of pattern doc instances covering version lock strategy.
- **In Scope**: 5-layer version lock problem, solution, applicability, and consequences.
- **Out of Scope**: Feature behavior (→ `feature/`), type inference algorithm (→ `algorithm/`).
### Overview Table
| 001 | [Version Lock](001_version_lock.md) | 5-layer protection for pinned Claude Code versions | ✅ |