Document MVP persistence limitations

Scripts/verify_persistence_limitations.py

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+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+EXPECTED = {
+    ROOT / "Docs" / "PersistenceDesignDocument.md": [
+        "## MVP Persistence Limitations",
+        "no database-backed world state yet",
+        "no account-provider identity binding yet",
+        "no save migration framework",
+        "no automated corrupted-save validator yet",
+        "no placed-container actor capture yet",
+        "no full offline player simulation or family/generational simulation yet",
+        "no cross-server persistence or shard transfer yet",
+        "no external backup replication",
+        "no player-facing save/load UI yet",
+        "no compatibility guarantee for pre-MVP experimental save files",
+    ],
+    ROOT / "AGRARIAN_DEVELOPMENT_ROADMAP.md": [
+        "[x] Document persistence limitations.",
+        "`Docs/PersistenceDesignDocument.md`",
+        "pre-MVP save compatibility",
+    ],
+}
+
+
+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("Persistence limitations verification failed: " + "; ".join(missing))
+
+    print("PASS: MVP persistence limitations are documented.")
+
+
+if __name__ == "__main__":
+    main()