Problem

Dedicated test_tiered*.py files, hook_tiered.py, and helper_tiered.py exist only to exercise tiered tables. After dual-purpose tests no longer import the mixin, these files and skip_for_hook("tiered") annotations are dead.

Change

Delete test/suite/test_tiered*.py, hooks/hook_tiered.py, then helpers/helper_tiered.py. Drop @skip_for_hook("tiered") (and related runningHook("tiered") helper bits) from remaining tests. Depends on the dual-purpose mixin strip landing first. Do not change src/.

Test

Python suite should collect without hook_tiered. Spot-check a previously skipped layered/disagg test still runs under the default (non-tiered) path.