fix(runtime): spread the frozen pending lists for arrayContaining (#8087)

TEST_DEBT is a shrink-only ratchet sitting exactly at its measurement, so the
readonly-array argument was a real +1 that had to be fixed rather than banked.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y26DJEHSBhhAQ6wwfsHNza

Author: claude

packages/runtime/src/error-envelope.conformance.test.ts

@@ -235,7 +235,10 @@ describe('#8087 — every code the dispatcher door can emit is parsed against Ap
         // every per-code assertion below would vacuously pass and this suite
         // would go quiet exactly when it had the most to say.
         expect(PENDING_AT_DISPATCHER_DOOR.length).toBeGreaterThan(0);
-        expect(PENDING_LEDGER_REGISTRATION).toEqual(expect.arrayContaining(PENDING_AT_DISPATCHER_DOOR));
+        // Spread: both lists are `readonly string[]`, and `arrayContaining`
+        // takes a mutable one — passing the frozen list straight in is a tsc
+        // error that only the TEST_DEBT ratchet would have caught.
+        expect(PENDING_LEDGER_REGISTRATION).toEqual(expect.arrayContaining([...PENDING_AT_DISPATCHER_DOOR]));
     });
 
     for (const code of PENDING_AT_DISPATCHER_DOOR) {