refactor: strengthen architecture CI gates and runtime contracts

scripts/architecture/coverage_ratchet.py

@@ -0,0 +1,85 @@
+"""对 Application 与 Domain 维护不可退化的行覆盖率阈值。"""
+
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+from typing import Any
+
+PROJECT_ROOT = Path(__file__).resolve().parents[2]
+DEFAULT_REPORT = PROJECT_ROOT / "coverage.json"
+DEFAULT_BASELINE = PROJECT_ROOT / "tests/fixtures/architecture/coverage-baseline.json"
+PACKAGE_PREFIXES = {
+    "application": "app/application/",
+    "domain": "app/domain/",
+}
+
+
+def collect_package_coverage(report: dict[str, Any]) -> dict[str, dict[str, int | float]]:
+    """按治理包聚合 coverage.py JSON 中的语句和已覆盖行。"""
+    result: dict[str, dict[str, int | float]] = {}
+    files = report.get("files", {})
+    for name, prefix in PACKAGE_PREFIXES.items():
+        statements = 0
+        covered = 0
+        for path, details in files.items():
+            if not path.replace("\\", "/").startswith(prefix):
+                continue
+            summary = details["summary"]
+            statements += int(summary["num_statements"])
+            covered += int(summary["covered_lines"])
+        percent = round(covered * 100 / statements, 2) if statements else 100.0
+        result[name] = {
+            "statements": statements,
+            "covered_lines": covered,
+            "percent": percent,
+        }
+    return result
+
+
+def compare_coverage(
+    baseline: dict[str, dict[str, int | float]],
+    current: dict[str, dict[str, int | float]],
+) -> list[str]:
+    """返回包覆盖率低于已提交阈值的问题。"""
+    problems = []
+    for name in PACKAGE_PREFIXES:
+        expected = float(baseline[name]["percent"])
+        actual = float(current[name]["percent"])
+        if actual < expected:
+            problems.append(f"{name}: 行覆盖率下降 {expected:.2f}%->{actual:.2f}%")
+    return problems
+
+
+def main() -> int:
+    """检查 coverage JSON，或显式刷新当前阈值。"""
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--write", action="store_true", help="写入当前覆盖率阈值")
+    parser.add_argument("--report", type=Path, default=DEFAULT_REPORT)
+    parser.add_argument("--baseline", type=Path, default=DEFAULT_BASELINE)
+    args = parser.parse_args()
+    report = json.loads(args.report.read_text(encoding="utf-8"))
+    current = collect_package_coverage(report)
+    if args.write:
+        args.baseline.parent.mkdir(parents=True, exist_ok=True)
+        args.baseline.write_text(
+            json.dumps(current, ensure_ascii=False, indent=2, sort_keys=True) + "\n",
+            encoding="utf-8",
+        )
+        print(f"已写入 {args.baseline.relative_to(PROJECT_ROOT)}")
+        return 0
+    baseline = json.loads(args.baseline.read_text(encoding="utf-8"))
+    problems = compare_coverage(baseline, current)
+    if problems:
+        print("\n".join(problems))
+        return 1
+    summary = ", ".join(
+        f"{name}={values['percent']:.2f}%" for name, values in current.items()
+    )
+    print(f"覆盖率 ratchet 通过（{summary}）")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())