fix: link emergent unknowns to answer-derived graph nodes

lib/graph/apply-proposal.js

@@ -87,6 +87,45 @@ function validateAddedUnknowns(graph, proposal) {
       .filter((node) => node.kind !== "unknown")
       .map((node) => node.id),
   ]);
+  const proposalNodeById = buildNodeById(graph, proposal.addedNodes);
+
+  function hasExplicitNodeReference(fromNode, toNodeId) {
+    if (!fromNode || !toNodeId) return false;
+
+    return (
+      fromNode.parentId === toNodeId ||
+      fromNode.dependsOn.includes(toNodeId) ||
+      fromNode.affects.includes(toNodeId) ||
+      fromNode.childIds.includes(toNodeId)
+    );
+  }
+
+  function hasExplicitAnswerDerivedRelationship(unknownNode) {
+    const connectedEdge = proposal.addedEdges.find(
+      (edge) =>
+        (edge.fromNodeId === unknownNode.id &&
+          answerDerivedNodeIds.has(edge.toNodeId)) ||
+        (edge.toNodeId === unknownNode.id &&
+          answerDerivedNodeIds.has(edge.fromNodeId)),
+    );
+
+    if (connectedEdge) {
+      return true;
+    }
+
+    for (const answerDerivedNodeId of answerDerivedNodeIds) {
+      const answerDerivedNode = proposalNodeById.get(answerDerivedNodeId);
+
+      if (
+        hasExplicitNodeReference(unknownNode, answerDerivedNodeId) ||
+        hasExplicitNodeReference(answerDerivedNode, unknownNode.id)
+      ) {
+        return true;
+      }
+    }
+
+    return false;
+  }
 
   for (const unknownNode of addedUnknowns) {
     const meaningKeys = [
@@ -128,15 +167,7 @@ function validateAddedUnknowns(graph, proposal) {
       );
     }
 
-    const connectedEdge = proposal.addedEdges.find(
-      (edge) =>
-        (edge.fromNodeId === unknownNode.id &&
-          answerDerivedNodeIds.has(edge.toNodeId)) ||
-        (edge.toNodeId === unknownNode.id &&
-          answerDerivedNodeIds.has(edge.fromNodeId)),
-    );
-
-    if (!connectedEdge) {
+    if (!hasExplicitAnswerDerivedRelationship(unknownNode)) {
       errors.push(
         `New unknown must be explicitly related to an answer-derived node: "${unknownNode.id}"`,
       );