feat: add safe distributed checkpoint intake and preflight

pyproject.toml

@@ -45,6 +45,7 @@ dependencies = [
 dev = [
     "build==1.2.2.post1",
     "hypothesis==6.165.3",
+    "jsonschema==4.25.1",
     "mypy==1.13.0",
     "pytest==9.1.1",
     "pytest-cov==7.1.0",
@@ -118,6 +119,9 @@ markers = [
     "operator_ui: tests that require the optional UI runtime",
 ]
 
+[tool.coverage.run]
+patch = ["subprocess"]
+
 [tool.mutmut]
 source_paths = ["obliteratus/", "scripts/"]
 only_mutate = [