test(stack): pin that containment needles carry no version envelope

The suite header documents the wire contract as a strict {sv: [...]}
with no version field, but assertContainmentNeedle only rejected
ciphertext — a regression reintroducing the v envelope would have
passed. One-line pin from CodeRabbit's review.

Claude-Session: https://claude.ai/code/session_01MxTTPaPP16m6br7Hoab94w

Author: coderdan

e2e/wasm/query-types.test.ts

@@ -90,6 +90,7 @@ function assertContainmentNeedle(term: unknown, label: string) {
     `${label}: expected an {sv: [...]} containment needle`,
   )
   assertEquals('c' in obj, false, `${label}: needle carries ciphertext`)
+  assertEquals('v' in obj, false, `${label}: needle carries a version envelope`)
 }
 
 Deno.test({