diff --git a/openspec/changes/gol-simulation/.openspec.yaml b/openspec/changes/archive/2026-11-08-gol-simulation/.openspec.yaml
similarity index 100%
rename from openspec/changes/gol-simulation/.openspec.yaml
rename to openspec/changes/archive/2026-11-08-gol-simulation/.openspec.yaml
diff --git a/openspec/changes/gol-simulation/design.md b/openspec/changes/archive/2026-11-08-gol-simulation/design.md
similarity index 100%
rename from openspec/changes/gol-simulation/design.md
rename to openspec/changes/archive/2026-11-08-gol-simulation/design.md
diff --git a/openspec/changes/gol-simulation/proposal.md b/openspec/changes/archive/2026-11-08-gol-simulation/proposal.md
similarity index 100%
rename from openspec/changes/gol-simulation/proposal.md
rename to openspec/changes/archive/2026-11-08-gol-simulation/proposal.md
diff --git a/openspec/changes/gol-simulation/specs/gol-simulation/spec.md b/openspec/changes/archive/2026-11-08-gol-simulation/specs/gol-simulation/spec.md
similarity index 100%
rename from openspec/changes/gol-simulation/specs/gol-simulation/spec.md
rename to openspec/changes/archive/2026-11-08-gol-simulation/specs/gol-simulation/spec.md
diff --git a/openspec/changes/gol-simulation/tasks.md b/openspec/changes/archive/2026-11-08-gol-simulation/tasks.md
similarity index 100%
rename from openspec/changes/gol-simulation/tasks.md
rename to openspec/changes/archive/2026-11-08-gol-simulation/tasks.md
diff --git a/openspec/specs/gol-simulation/spec.md b/openspec/specs/gol-simulation/spec.md
new file mode 100644
index 0000000..8d7b799
--- /dev/null
+++ b/openspec/specs/gol-simulation/spec.md
@@ -0,0 +1,85 @@
+# gol-simulation Specification
+
+## Purpose
+Defines Conway's Game of Life simulation behavior, including ticking, pause/resume, stepping, speed control, and paused-only cell editing.
+
+## Requirements
+
+### Requirement: Simulation applies Conway's rules
+The system SHALL advance the grid by one generation per tick using Conway's rules with wall boundaries.
+
+#### Scenario: Tick advances grid
+- **WHEN** a tick occurs
+- **THEN** each cell's next state follows Conway's rules based on its eight neighbors
+
+### Requirement: Simulation starts paused
+The system SHALL start with the simulation paused.
+
+#### Scenario: Initial state
+- **WHEN** the application starts
+- **THEN** the simulation is paused
+
+### Requirement: Pause can be toggled
+The system SHALL toggle between paused and running when the pause action is triggered.
+
+#### Scenario: Toggle pause
+- **WHEN** the user triggers the pause action
+- **THEN** the simulation switches between paused and running
+
+### Requirement: Single step advances one generation
+The system SHALL advance exactly one generation when the step action is triggered while paused.
+
+#### Scenario: Step while paused
+- **WHEN** the simulation is paused and the user triggers step
+- **THEN** the grid advances by one generation
+- **AND** the simulation remains paused
+
+### Requirement: Step is ignored while running
+The system SHALL ignore the step action while the simulation is running.
+
+#### Scenario: Step while running
+- **WHEN** the simulation is running and the user triggers step
+- **THEN** no extra generation is applied
+
+### Requirement: Speed is adjustable
+The system SHALL change the tick interval when speed_up or speed_down is triggered, within supported bounds.
+
+#### Scenario: Speed up
+- **WHEN** the user triggers speed_up
+- **THEN** the tick interval decreases (simulation runs faster)
+
+#### Scenario: Speed down
+- **WHEN** the user triggers speed_down
+- **THEN** the tick interval increases (simulation runs slower)
+
+### Requirement: Cell editing only while paused
+The system SHALL allow editing cells only while the simulation is paused.
+
+#### Scenario: Edit while paused
+- **WHEN** the simulation is paused and the user clicks a cell
+- **THEN** the cell state changes according to the mouse button
+
+#### Scenario: No edit while running
+- **WHEN** the simulation is running and the user clicks a cell
+- **THEN** the grid is not modified by the click
+
+### Requirement: Left click sets cell alive
+The system SHALL set the clicked cell to alive when the left mouse button is pressed while paused.
+
+#### Scenario: Set alive
+- **WHEN** the simulation is paused and the user left-clicks a cell
+- **THEN** that cell becomes alive
+
+### Requirement: Right click sets cell dead
+The system SHALL set the clicked cell to dead when the right mouse button is pressed while paused.
+
+#### Scenario: Set dead
+- **WHEN** the simulation is paused and the user right-clicks a cell
+- **THEN** that cell becomes dead
+
+### Requirement: Drag paints cells
+The system SHALL paint cells while dragging with the left button (alive) or right button (dead) while paused.
+
+#### Scenario: Drag paint
+- **WHEN** the simulation is paused and the user drags with left button held
+- **THEN** cells under the cursor become alive