Save/Load Systems JSON serialization, version migration, and PERSIST group patterns define robust data persistence. NEVER Do - NEVER save without a version field — When you update your game's data structure, old saves will break. Always include a field and implement migration logic. - NEVER use absolute OS paths — Hardcoding will break on every other machine. Always use the protocol, which Godot maps to the correct OS-specific app data folder. - NEVER attempt to save Node references directly — Nodes are objects, not raw data. Extract the necessary primitive data (positions, health, levels) in…