docs: add gol-simulation OpenSpec change

Plan Game of Life mechanics: Conway rules, pause/resume, stepping, speed control, and paused-only cell editing with drag painting.
2026-11-08 15:39:25 +01:00
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+# Tasks
+
+## 1. Simulation core
+
+- [ ] 1.1 Implement Conway tick using a second grid buffer and swap, verifying a known pattern (blinker) oscillates.
+- [ ] 1.2 Add tick timing in the frame loop with adjustable interval, verifying ticks occur at configured rate.
+
+## 2. Controls
+
+- [ ] 2.1 Wire pause/step/speed actions to simulation state, verifying pause stops ticks and step advances one generation.
+- [ ] 2.2 Add default key bindings for p/n/+/- and verify config tests pass.
+
+## 3. Editing
+
+- [ ] 3.1 Implement paused-only cell editing on left/right click, verifying clicks change cell state only when paused.
+- [ ] 3.2 Implement drag painting while paused, verifying drag sets/clears cells.
+
+## 4. Verification
+
+- [ ] 4.1 Build and run ctest, verifying all tests pass.
+- [ ] 4.2 Manual run: verify pause, step, speed, editing, and Esc.