test(async): extend #1013 coverage to cross-module property-return shape

[proggeramlug]

Follow-up to PR #1064 per @andrewtdiz's review feedback (comment).

PR #1064 pinned the same-file literal-return shape — covers the dispatch bug. The original gscmaster-api repro from #1013 used cross-module imported async helpers that awaited an inner lookup and returned a property read off the resolved value (return user.accessToken). That shape isn't exercised by the previous test.

This PR adds test-files/fixtures/issue_1013/user_lookup.ts exporting getAccessToken / getUserPlan against an inner await lookupUser(id), each returning a property read. The test now destructures both shapes from Promise.all:

// same-file literal — covers dispatch
const [a, b] = await Promise.all([fetchA(), fetchB()]);

// cross-module property-return — original #1013 surface
const [accessToken, userPlan] = await Promise.all([
    getAccessToken("u1"),
    getUserPlan("u1"),
]);

Verified byte-for-byte against node --experimental-strip-types.

No version bump or changelog change.