- POST /api/action/pause - pause game (AI must call before operations)
- POST /api/action/unpause - resume game at desired speed
- POST /api/action/speed - set game speed (1x/2x/3x)
- Game state now includes isPaused and gameSpeed
- AI pause protocol documented in SKILL.md: pause before every operation
- Introduces cell.isDiggable flag that filters neutronium properly
- pause/unpause/speed CLI commands added to oni_api.py
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