docs: archive arena-size change and sync specs

Archive completed change and add arena-sizing main spec.
2026-11-08 16:11:03 +01:00
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 # arena-sizing Specification
 ## Purpose
 Defines how the arena default size is derived from the output and how resizing affects the grid.
 ## Requirements
 ### Requirement: Default arena is about 80% of output
 The system SHALL compute the default logical window size as 80% of the output mode dimensions divided by the active scale.
 #### Scenario: Output available
 - **WHEN** output mode and scale are known at startup
 - **THEN** the default logical window size is approximately 80% of the output
 ### Requirement: Fallback when output unknown
 The system SHALL use a fallback default size when output info is unavailable.
 #### Scenario: No output info
 - **WHEN** output mode is not reported
 - **THEN** a fallback logical size is used
 ### Requirement: Cell size remains 8 logical pixels
 The system SHALL keep an 8 logical pixel cell size.
 #### Scenario: Grid dimensions
 - **WHEN** the logical window size is known
 - **THEN** grid columns and rows are logical size divided by 8
 ### Requirement: Resizable window
 The system SHALL allow the window to be resized by the user.
 #### Scenario: Resize
 - **WHEN** the user resizes the window
 - **THEN** the grid dimensions update accordingly
 ### Requirement: Grid preserved on resize
 The system SHALL preserve overlapping cells when the grid dimensions change.
 #### Scenario: Enlarge
 - **WHEN** the window grows
 - **THEN** existing cells within the old bounds remain