Combine Workshop addon and fix prison startup

Merge owned systems into one addon while preserving resource identities. Gate player admission on the replicated prison scene, restore the original framed door, and hold enemy AI until escape. Correct scenario branding and author metadata, include publishing assets, and retain regression and native verification evidence.

tools/prefab_identity.py

@@ -0,0 +1,36 @@
+"""Check serialized root entity IDs required for reproducible prefab replication."""
+import re
+
+
+def root_id(text):
+    # Braces in resource strings and comments must not change object depth.
+    tokens = re.findall(r'//[^\n]*|/\*[\s\S]*?\*/|"(?:\\.|[^"\\])*"|[{}]|\b\w+\b', text)
+    tokens = [token for token in tokens if not token.startswith(('//', '/*'))]
+    depth = 0
+    identities = []
+    for index, token in enumerate(tokens):
+        if token == '{':
+            depth += 1
+        elif token == '}':
+            depth -= 1
+        elif token == 'ID' and depth == 1:
+            identities.append(tokens[index + 1] if index + 1 < len(tokens) else '')
+    if len(identities) != 1 or not re.fullmatch(r'"[A-F0-9]{16}"', identities[0]):
+        raise ValueError('Prefab needs exactly one saved root entity ID')
+    identity = identities[0][1:-1]
+    if identity == '0000000000000000':
+        raise ValueError('Prefab root entity ID must not be zero')
+    return identity
+
+
+def check_prefabs(paths):
+    seen = {}
+    for path in sorted(paths):
+        try:
+            identity = root_id(path.read_text())
+        except ValueError as error:
+            raise ValueError(f'{path}: {error}') from error
+        if identity in seen:
+            raise ValueError(f'Duplicate prefab root ID {identity}: {seen[identity]} and {path}')
+        seen[identity] = path
+    return len(seen)