feat: sync latest ARR implementation

arr_processing/policy.py

@@ -0,0 +1,35 @@
+"""Neutral discovery of the frozen ARR deterministic processor identity."""
+
+from __future__ import annotations
+
+import importlib.util
+import sys
+from pathlib import Path
+
+from arr_ingestion.validation import ProcessorPolicy
+
+
+def load_processor_policy(project_root: Path) -> ProcessorPolicy:
+    skill_root = (project_root / "arr-opera-daily-ingest").resolve()
+    script = skill_root / "scripts" / "process_daily.py"
+    module_name = "_arr_runtime_process_daily"
+    specification = importlib.util.spec_from_file_location(module_name, script)
+    if specification is None or specification.loader is None:
+        raise ValueError("ARR daily processor identity is unavailable")
+    module = importlib.util.module_from_spec(specification)
+    prior = sys.modules.get(module_name)
+    sys.modules[module_name] = module
+    try:
+        specification.loader.exec_module(module)
+        processor_version = str(module.PROCESSOR_VERSION)
+        rule_set_sha256 = str(module.rule_set_sha256())
+    finally:
+        if prior is None:
+            sys.modules.pop(module_name, None)
+        else:
+            sys.modules[module_name] = prior
+    return ProcessorPolicy(
+        processor_version=processor_version,
+        rule_set_sha256=rule_set_sha256,
+        skill_root=skill_root,
+    )