debug: log tangled transform output to diagnose empty repo_did DB projection transforms are already composed into morphisms at codegen time. Adding debug logging to see what the single lift_wtype_sigma pass actually produces.

147147         record: &serde_json::Value,
148148     ) -> Option<Result<serde_json::Value>> {
149149         let morphism = self.tangled_morphisms.get(tangled_nsid)?;
150-        let cospan_record = match apply_morphism(morphism, record) {
151-            Ok(r) => r,
152-            Err(e) => return Some(Err(e)),
153-        };
154-        // After morphism, apply the Cospan DB projection (AT-URI decomposition, etc.)
155-        let cospan_nsid = &morphism.cospan_nsid;
156-        if let Some(proj) = self.db_projections.get(cospan_nsid) {
157-            Some(apply_projection(&proj.schema, &proj.compiled, cospan_nsid, &cospan_record))
158-        } else {
159-            Some(Ok(cospan_record))
150+        let result = apply_morphism(morphism, record);
151+        if let Ok(ref json) = result {
152+            tracing::debug!(
153+                tangled = tangled_nsid,
154+                cospan = %morphism.cospan_nsid,
155+                has_repo_did = json.get("repoDid").is_some(),
156+                has_repo = json.get("repo").is_some(),
157+                keys = ?json.as_object().map(|o| o.keys().collect::<Vec<_>>()),
158+                "tangled transform output"
159+            );
160160         }
161+        Some(result)
161162     }
162163 }
163164