test(qa-lab): allow codex fixtures in deadcode

Author: samzong

scripts/deadcode-unused-files.allowlist.mjs

@@ -37,4 +37,8 @@ export const KNIP_UNUSED_FILE_ALLOWLIST = [
 // Knip can disagree across supported local/CI platforms for files that are
 // only reachable through test-only import graphs. Ignore these when reported,
 // but do not require them to be reported.
-export const KNIP_OPTIONAL_UNUSED_FILE_ALLOWLIST = ["src/gateway/test/server-sessions-helpers.ts"];
+export const KNIP_OPTIONAL_UNUSED_FILE_ALLOWLIST = [
+  "extensions/qa-lab/src/auth-profile-fixture.ts",
+  "extensions/qa-lab/src/codex-plugin-fixture.ts",
+  "src/gateway/test/server-sessions-helpers.ts",
+];