APS renderer browser spec assumes the coupled Prebid bundle and times out with the decoupled shim

[aram356]

Problem

crates/trusted-server-integration-tests/browser/tests/shared/aps-renderer.spec.ts ("renders a trustedServer adapter bid using Prebid's generated GAM ad ID") loads the external Prebid bundle and relies on it carrying the tsjs shim, which registers the trustedServer bid adapter.

After the prebid decoupling (#967) the external bundle is pure Prebid.js — the shim ships separately as the deferred tsjs-prebid.js module. The spec never loads it, so no adapter registers, the in-page auction never completes, and the test times out after 30s.

Impact

• rc/july "Integration Tests" (browser integration tests job) red since the Decouple the prebid tsjs shim from the bundled Prebid.js #967 merge (78632fe33), both wordpress and nextjs suites.
• Not caught on either source PR: the spec lives on Register APS renderer via bid.meta so it survives Prebid field stripping #963's branch (no decoupling there), and Decouple the prebid tsjs shim from the bundled Prebid.js #967's branch doesn't contain the spec. The failure only exists where the two meet.

Fix

#988 (stacked on #963) makes the spec bundle-shape aware: it detects the decoupled bundle via the window.__tsjs_prebid_bundle manifest stamp and loads dist/tsjs-prebid.js after the external bundle — the same script order the server serves. Coupled worlds are unaffected.

Verified locally by running the spec standalone: pre-fix reproduces the exact CI timeout, post-fix passes in ~200ms.