fix(release): prepare aligned 0.1.45 composition and guarded candidate sequencing

tools/release/govoplan_release/version_metadata.py

@@ -269,6 +269,7 @@ def _render_python_version(
     except SyntaxError as exc:
         raise VersionMetadataError(f"Python metadata is malformed: {path.name}") from exc
     values: list[ast.Constant] = []
+    module_version_references = 0
     for node in ast.walk(tree):
         if not isinstance(node, ast.Call) or _call_name(node.func) != target_name:
             continue
@@ -279,6 +280,28 @@ def _render_python_version(
                 and isinstance(keyword.value.value, str)
             ):
                 values.append(keyword.value)
+            elif (
+                keyword.arg == keyword_name
+                and isinstance(keyword.value, ast.Name)
+                and keyword.value.id == "MODULE_VERSION"
+            ):
+                module_version_references += 1
+    if module_version_references:
+        if module_version_references != 1 or values:
+            raise VersionMetadataError(
+                f"Python metadata has multiple {target_name}.{keyword_name} values: {path.name}"
+            )
+        rendered, found = _render_python_assignment(
+            payload,
+            path=path,
+            assignment_name="MODULE_VERSION",
+            version=version,
+        )
+        if not found:
+            raise VersionMetadataError(
+                f"Python metadata has no literal MODULE_VERSION declaration: {path.name}"
+            )
+        return rendered, True
     if not values:
         return payload, False
     if len(values) != 1: