Harden scale-registered SynthID detection

tests/test_cli.py

@@ -741,6 +741,7 @@ class TestDetectSynthIDCommand:
         result = runner.invoke(main, ["detect-synthid", "--help"])
         assert result.exit_code == 0
         assert "calibrated image sizes" in result.output
+        assert "--register-scale" in result.output
 
     def test_unsupported_geometry_is_machine_readable(self, runner, tmp_clean_png):
         result = runner.invoke(main, ["detect-synthid", str(tmp_clean_png), "--json"])
@@ -750,6 +751,23 @@ class TestDetectSynthIDCommand:
         assert payload["status"] == "unsupported"
         assert payload["score"] is None
 
+    def test_registered_scale_mode_is_machine_readable(self, runner, tmp_clean_png):
+        from remove_ai_watermarks.synthid_detector import (
+            REGISTERED_DETECTOR_ID,
+            REGISTERED_THRESHOLD,
+        )
+
+        result = runner.invoke(
+            main,
+            ["detect-synthid", str(tmp_clean_png), "--register-scale", "--json"],
+        )
+
+        assert result.exit_code == 0, result.output
+        payload = json.loads(result.output)
+        assert payload["status"] == "unsupported"
+        assert payload["threshold"] == REGISTERED_THRESHOLD
+        assert payload["detector"] == REGISTERED_DETECTOR_ID
+
     def test_non_json_output_preserves_negative_scope(self, runner, tmp_clean_png):
         result = runner.invoke(main, ["detect-synthid", str(tmp_clean_png)])
 
@@ -757,6 +775,15 @@ class TestDetectSynthIDCommand:
         assert "unsupported" in result.output
         assert "not proof that SynthID is absent" in result.output
 
+    def test_registered_non_json_output_names_the_bounded_search(self, runner, tmp_clean_png):
+        result = runner.invoke(
+            main,
+            ["detect-synthid", str(tmp_clean_png), "--register-scale"],
+        )
+
+        assert result.exit_code == 0, result.output
+        assert "Bounded spatial-scale registration was enabled" in result.output
+
 
 class TestBatchCommand:
     """Tests for the 'batch' subcommand."""