feat: implement GEWU service and local agent workflows

tests/application/crash_acceptance_worker.py

@@ -0,0 +1,29 @@
+"""Terminate acceptance at a durable publication boundary for recovery tests."""
+
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+
+from gewu.domain.contracts import ProposalRevision
+from tests.application.test_acceptance import ACTOR, _service
+
+
+def main() -> None:
+    data_root = Path(sys.argv[1])
+    proposal_path = Path(sys.argv[2])
+    crash_stage = sys.argv[3]
+    proposal = ProposalRevision.model_validate_json(proposal_path.read_bytes(), strict=True)
+
+    def terminate(stage: str) -> None:
+        if stage == crash_stage:
+            os._exit(73)
+
+    service, *_ = _service(data_root, hook=terminate)
+    service.submit(proposal, actor=ACTOR)
+    raise RuntimeError(f"Acceptance completed without reaching crash stage {crash_stage}")
+
+
+if __name__ == "__main__":
+    main()