{
  "schema_version": 1,
  "id": "B-l5-hidden-requirement",
  "axis": "B",
  "rung": 5,
  "difficulty": {"level": 5, "files": 10},
  "backend": "local",
  "fixture": "../B-l3-ten-files/fixture",
  "prompt": "prompts/L5.md",
  "verify": ["cargo test --quiet"],
  "limits": {"wall_seconds": 1200, "verify_seconds": 300},
  "anti_cheat": ["tests_unmodified"],
  "diagnostics": ["workspace_diff", "test_log", "trajectory"],
  "provider": "deepseek"
}