Document save recovery plan

Scripts/verify_save_recovery_plan.py

@@ -0,0 +1,42 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+EXPECTED = {
+    ROOT / "Docs" / "Ops" / "PersistenceSaveRecoveryPlan.md": [
+        "Saved/SaveGames/AgrarianMVP.sav",
+        "Saved/SaveGames/Backups",
+        "Copy the current `AgrarianMVP.sav` aside with a `.suspect` suffix.",
+        "Copy that backup to `Saved/SaveGames/AgrarianMVP.sav`.",
+        "There is no automated save-file validation tool yet.",
+    ],
+    ROOT / "Docs" / "PersistenceDesignDocument.md": [
+        "`Docs/Ops/PersistenceSaveRecoveryPlan.md`",
+        "preserve the suspect save",
+        "restore the newest timestamped",
+    ],
+    ROOT / "AGRARIAN_DEVELOPMENT_ROADMAP.md": [
+        "[x] Add recovery plan for corrupted save.",
+        "`Docs/Ops/PersistenceSaveRecoveryPlan.md`",
+        "current MVP limitations",
+    ],
+}
+
+
+def main() -> None:
+    missing = []
+    for path, snippets in EXPECTED.items():
+        text = path.read_text(encoding="utf-8")
+        for snippet in snippets:
+            if snippet not in text:
+                missing.append(f"{path.relative_to(ROOT)}: {snippet}")
+
+    if missing:
+        raise RuntimeError("Save recovery plan verification failed: " + "; ".join(missing))
+
+    print("PASS: corrupted-save recovery plan is documented.")
+
+
+if __name__ == "__main__":
+    main()