Add README localization parity check

Author: OliverZhaohaibin

tools/check_readme_parity.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+"""Keep the maintained EN/ZH/DE README release/runtime contracts aligned."""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+READMES = (
+    ROOT / "README.md",
+    ROOT / "docs/readme/README_zh-CN.md",
+    ROOT / "docs/readme/README_de.md",
+)
+
+REQUIRED = (
+    "v6.6.8",
+    "v6.68-x86-setup.exe",
+    "iphotron_6.6.8_amd64.deb",
+    "iPhotron-6.6.8-x86_64.AppImage",
+    "com.github.OliverZhaohaibin.iPhotron-6.6.8-x86_64.flatpak",
+    "iPhoto.entrypoint:main",
+    "DesktopCoordinatorRuntime",
+    "species-bounded-single-link-v3",
+    "torchscript_url",
+    "BUILD_FLATPAK.md",
+)
+
+
+def main() -> int:
+    failures: list[str] = []
+    for path in READMES:
+        if not path.is_file():
+            failures.append(f"missing maintained README: {path.relative_to(ROOT)}")
+            continue
+        text = path.read_text(encoding="utf-8")
+        for token in REQUIRED:
+            if token not in text:
+                failures.append(f"{path.relative_to(ROOT)}: missing parity token {token!r}")
+
+    if failures:
+        print("README parity check failed:", file=sys.stderr)
+        for failure in failures:
+            print(f"- {failure}", file=sys.stderr)
+        return 1
+
+    print("README parity OK: EN/ZH/DE release and runtime contracts are aligned.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())