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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+# Spec Delta
+
+## ADDED Requirements
+
+### Requirement: Additional built-in patterns are available
+The system SHALL provide additional built-in patterns (Beacon, Loaf, Boat, Tub, R-pentomino, Acorn) selectable via keys 5-0.
+
+#### Scenario: Select beacon
+- **WHEN** the user triggers `select:beacon`
+- **THEN** a beacon preview is shown
+
+### Requirement: New patterns support rotation
+The system SHALL support 90-degree rotation for all new patterns.
+
+#### Scenario: Rotate new pattern
+- **WHEN** the user rotates a new pattern preview
+- **THEN** its cells rotate accordingly