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Keep repositories at aggregate root boundaries.\n\nIf detailed checklists are needed, open `references/tactical-checklist.md`.\n\n## Example\n\n```typescript\nclass Order {\n  private status: \"draft\" | \"submitted\" = \"draft\";\n\n  submit(itemsCount: number): void {\n    if (itemsCount === 0) throw new Error(\"Order cannot be submitted empty\");\n    if (this.status !== \"draft\") throw new Error(\"Order already submitted\");\n    this.status = \"submitted\";\n  }\n}\n```\n\n## Limitations\n\n- This skill does not define deployment architecture.\n- It does not choose databases or transport protocols.\n- It should be paired with testing patterns for invariant 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