docs: archive more-patterns change and sync specs

Archive completed change and update pattern-placement spec.
2026-11-08 16:22:44 +01:00
parent ed6c9c81f3
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+# 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.