# Proposal

## Why

The application now supports input, pattern placement, and HiDPI rendering, but has no Game of Life dynamics. This change adds the actual automaton: Conway's rules, pause/resume, single stepping, speed control, and mouse editing of cells, so the tool becomes usable for exploring patterns.

## What Changes

- Add Conway's Game of Life simulation that updates the cell grid on a timer.
- Start paused by default; allow pause/resume, single-step, and speed changes.
- Allow mouse editing of cells (left click sets alive, right click sets dead) only while paused, including drag painting.
- Add default key bindings for pause (`p`), step (`n`), and speed (`+`/`-`).
- Render simulation state and reflect pause/editing in the UI (via stdout status).

## Capabilities

### New Capabilities

- `gol-simulation`: Conway rules, tick timing, pause/resume, stepping, speed control, and paused-only editing.

### Modified Capabilities

None.

## Impact

- Affected code: `wlgol.c`, `grid.c/h` (read during ticks), possibly new `simulation.c/h`.
- Reuses existing input/config infrastructure; no new dependencies.
- Config defaults updated with simulation keys.