* fix(cli,hub): resolve typecheck errors in codex reasoning effort and notification test
- Cast `getModelReasoningEffort()` return (string | null) to
`ReasoningEffort | undefined` at three call sites in
codexLocalLauncher.ts and runCodex.ts where the narrower type is
expected.
- Add missing `modelReasoningEffort: null` default in
notificationHub.test.ts to satisfy the Session type contract.
These errors were introduced in 79a13d2 and have been failing CI on
main since 2026-04-10.
* fix(cli): add missing getModelReasoningEffort to test mock session
The test stub in codexLocalLauncher.test.ts was missing the
getModelReasoningEffort method added in 79a13d2, causing runtime
TypeError in CI.
