perf(javascript): reduce retained semantic analysis allocations (#1601)

Reduce retained semantic allocations and memoize lexical scope ancestry while preserving semantic identities. Refs #1065 and #1563; the complete-directory memory failure remains open.

src/domain/javascript/javascriptSemanticCalls.ts

@@ -428,4 +428,10 @@ const enclosingFunction = (
 const semanticCallSiteId = (
   node: t.CallExpression | t.OptionalCallExpression | t.NewExpression,
 ): string =>
-  `call:${t.isNewExpression(node) ? "construct" : "call"}:${String(node.start ?? -1)}:${String(node.end ?? -1)}`;
+  // Join once so retained IDs do not keep a chain of intermediate strings.
+  [
+    "call",
+    t.isNewExpression(node) ? "construct" : "call",
+    String(node.start ?? -1),
+    String(node.end ?? -1),
+  ].join(":");