feat(sp37): cyclone submit-batch CLI

Walks batch-*-claims/*.x12 under --ingest-dir, calls submit_file per
file, prints submitted/skipped/failed counts. Exits 0 even on
per-file failures (details in stdout); exits 2 on config-level
errors (no clearhouse, stub mode, missing dir).

This is the canonical outbound path; resubmit-rejected-claims
remains for one-off cases where no DB row is wanted.

backend/tests/test_submission.py

@@ -193,3 +193,16 @@ def test_submit_file_uses_default_paramiko_factory(monkeypatch):
     )
     assert result.outcome == SubmitOutcome.SUBMITTED
     assert len(fake_paramiko_sftp.put_calls) == 1
+
+
+def test_submit_batch_cli_help():
+    """`cyclone submit-batch --help` exits 0 and shows the flags."""
+    import subprocess
+    import sys
+    result = subprocess.run(
+        [sys.executable, "-m", "cyclone.cli", "submit-batch", "--help"],
+        capture_output=True, text=True,
+        cwd=str(Path(__file__).parent.parent),
+    )
+    assert result.returncode == 0
+    assert "--ingest-dir" in result.stdout