docs(P01): complete adapter-dedup-diagnostic phase (v1.13.4)

---ci---
project: acdl
phase: 1
milestone: v1.14
status: complete
requirements:
  covered: [REQ-135]
  partial: []
---/ci---

tests/test_adapter.py

@@ -330,4 +330,35 @@ class TestChildIdHelper:
         # ecs-service expands to service-task-definition + service-service
         assert _child_id(["service-task-definition", "service-service"]) == "service"
         # alb expands to alb-loadbalancer + alb-targetgroup + alb-listener
-        assert _child_id(["alb-loadbalancer", "alb-targetgroup", "alb-listener"]) == "alb"
+        assert _child_id(["alb-loadbalancer", "alb-targetgroup", "alb-listener"]) == "alb"
+
+
+class TestAdapterDedupRejectsUnregisteredModule:
+    """P1-1 (v1.14, REQ-135): a resource whose module is not in the
+    registry must raise ValueError, not be silently dropped from the
+    dedup merge. A typo'd module field (e.g. 'iam-role' vs 'iam_roles')
+    must surface as a diagnostic, not vanish."""
+
+    def test_unregistered_module_raises_valueerror(self, tmp_path):
+        stack = {
+            "resources": [
+                {"id": "bad", "type": "aws:bogus:thing", "module": "nonexistent@1.0.0", "inputs": {}}
+            ],
+            "outputs": {},
+            "data_sources": [],
+        }
+        with pytest.raises(ValueError, match="no terraform_dir for module 'nonexistent'"):
+            adapt(stack, str(tmp_path))
+
+    def test_registered_module_still_works(self, tmp_path):
+        """A registered module (s3) must still emit valid terraform — the
+        ValueError guard must not break the happy path."""
+        stack = {
+            "resources": [
+                {"id": "s3", "type": "aws:s3:bucket", "module": "s3@1.0.0", "inputs": {"bucket_name": "test"}}
+            ],
+            "outputs": {},
+            "data_sources": [],
+        }
+        adapt(stack, str(tmp_path))
+        assert (tmp_path / "main.tf").exists()