# Design

## Context

Pattern module currently has 4 patterns with static offsets. Config maps digits 1-4.

## Goals / Non-Goals

**Goals:**
- Add 6 patterns with correct offsets.
- Extend default config digits 5-0.

**Non-Goals:**
- Pattern editor.
- Loading from files.

## Decisions

### D1: Pattern storage
- Add static offset arrays and entries in `patterns[]`.

### D2: Key mapping
- 5=Beacon, 6=Loaf, 7=Boat, 8=Tub, 9=R-pentomino, 0=Acorn.

### D3: Config enum
- Add `ACTION_SELECT_BEACON` etc. or refactor? Use new enum values for minimal change.

## Open Questions

None.