test(runtime-host): UDS session-branch tests exceed the 5 s shutdown deadline under CI load

**Tests**: `two UDS Clients share stable Session creation, CAS configuration, and catalog continuity` and `two UDS Clients share exact retryable Session branch and revision authority` (packages/runtime-host)

**Failure mode**:

```
AggregateError: Runtime Host shutdown did not cleanly close every resource
AggregateError: Unable to close Runtime Host execution composition
```

Both tests time out at ~5.5 s and fail with shutdown resource-close errors.

**Observed**: #2279 and #2270 `test_runtime_host`; both passed on rerun. Unrelated to the dependency changes under test — also seen on a @types/node-only PR.

**Suggested fix**: extend the deadline or make the close sequence report progress; investigate whether shutdown stalls on a specific resource under load.