{
  "artifact": "Cross-layer interface contract and bottleneck calculator",
  "chapter": "Why Useful Quantum Computers Are Systems Engineering Projects",
  "chapter_url": "https://www.steven-geller.com/playground/quantum/book/53-useful-quantum-computers-are-systems-engineering-projects/",
  "date_modified": "2026-08-14",
  "dependencies": [],
  "expected_exit_code": 0,
  "expected_stdout": "PASS: 53 bottleneck evidence fixtures={'timing': 'timing', 'routing': 'routing', 'decoder': 'decoder', 'failure': 'failure'} changed=decoder mixed_units_rejected=True\n",
  "fixture_sha256": "bb0a6f587ce0af222c45b81d682edf8d89bfbbb03f08b2798e70e33c1d725979",
  "manifest_test_command": "python3 tools/validate_briefs.py --briefs data/editorial_briefs_36_63.json --from 36 --through 63 --check-rewritten-sources --execute-artifacts",
  "pass_condition": "Schema enforces dimensional consistency; tests identify known timing, routing, decoder, and failure-budget bottlenecks in four fixtures and change the result when the controlling assumption changes.",
  "python_requires": ">=3.11",
  "run_command": "python3 fixture.py",
  "schema_version": "1.1.0",
  "test_method": "Run the isolated fixture; require exit code 0 and exact stdout."
}