- Added `atmos` property to the `General` interface in `entities.ts`.
- Initialized `atmos` to 0 in the `buildGeneralSeeds` function in `bootstrap.ts`.
- Updated exports in `index.ts` to include `unitSet.js`.
- Introduced new types for crew types and their requirements in `types.ts`.
- Implemented `unitSetLoader.ts` for loading unit set definitions from JSON files.
- Created `che_징병.ts` action for recruiting crew types with cost and training calculations.
- Developed `unitSet.ts` for handling crew type availability and requirements.
- Added tests for crew type availability and unit set parsing in `crewType.test.ts`.
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