fix: D2 module renderer missing direct module-to-module edges from project deps

crates/adapters/d2/src/d2_renderer.rs

@@ -117,6 +117,14 @@ fn render_module(graph: &CodeGraph) -> String {
         if rel.kind() == RelationshipKind::Import {
             continue;
         }
+        // Direct module-to-module edge (from merged project deps)
+        if modules.contains(rel.source())
+            && modules.contains(rel.target())
+            && rel.source() != rel.target()
+        {
+            edges.insert((rel.source().to_string(), rel.target().to_string()));
+            continue;
+        }
         let src_mod = name_to_module.get(rel.source());
         let tgt_mod = name_to_module.get(rel.target());
         if let (Some(s), Some(t)) = (src_mod, tgt_mod)