refactor(javascript)!: share semantic evidence at fact construction

Intern shared provenance in a graph-scoped context registry while retaining exact locations on every fact. Semantic traces carry their referenced context subset, and portable graph validation rejects stale or dangling commitments.

BREAKING CHANGE: Semantic graph facts now store evidence context IDs and locations. Graph and semantic trace results require an inline evidence_contexts table.

src/application/javascript/JavaScriptSemanticGraphDataProjection.ts

@@ -307,14 +307,17 @@ const addDataUnknown = (input: DataUnknownInput): void => {
   } = input;
   addSemanticGraphUnknown(
     context.state,
-    createJavaScriptSemanticGraphUnknown({
-      node_id: node.node_id,
-      family,
-      relation_kinds: relationKinds,
-      reason: "ambiguous-target",
-      detail,
-      candidate_node_ids: candidateNodeIds,
-      evidence: unknownSemanticEvidence(context.file, location),
-    }),
+    createJavaScriptSemanticGraphUnknown(
+      {
+        node_id: node.node_id,
+        family,
+        relation_kinds: relationKinds,
+        reason: "ambiguous-target",
+        detail,
+        candidate_node_ids: candidateNodeIds,
+        evidence: unknownSemanticEvidence(context.file, location),
+      },
+      context.state.evidenceContexts,
+    ),
   );
 };