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.

tests/test_prefab_identity.py

@@ -0,0 +1,36 @@
+"""Reject the missing-root-ID condition that caused RKS #2's replication kick."""
+from pathlib import Path
+import sys
+import tempfile
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'tools'))
+from prefab_identity import check_prefabs, root_id
+
+
+def rejects(text):
+    try:
+        root_id(text)
+    except ValueError:
+        return
+    raise AssertionError('Accepted invalid root identity')
+
+
+assert root_id('GenericEntity { ID "1234567890ABCDEF" }') == '1234567890ABCDEF'
+assert root_id('GenericEntity : "{ABCDEF1234567890}Prefab.et" {\n'
+               '/* } */ components {} // {\n ID "1234567890ABCDEF" }') == '1234567890ABCDEF'
+rejects('GenericEntity { components { RplComponent "{1234567890ABCDEF}" {} } }')
+rejects('GenericEntity { { GenericEntity { ID "1234567890ABCDEF" } } }')
+rejects('GenericEntity { ID "0000000000000000" }')
+rejects('GenericEntity { ID "123" }')
+rejects('GenericEntity { ID "1234567890ABCDEF" ID "1234567890ABCDE0" }')
+with tempfile.TemporaryDirectory() as directory:
+    paths = [Path(directory) / name for name in ('one.et', 'two.et')]
+    for path in paths:
+        path.write_text('GenericEntity { ID "1234567890ABCDEF" }')
+    try:
+        check_prefabs(paths)
+    except ValueError as error:
+        assert 'Duplicate prefab root ID' in str(error)
+    else:
+        raise AssertionError('Accepted duplicate root identities')
+print('PASS: missing, child-only, malformed, zero and duplicate prefab root IDs rejected')