Problem

schema_drop.c, schema_alter.c, schema_truncate.c, and schema_worker.c still implement tiered: / object: / tier: drop, alter, truncate, and worker paths after the tests that used them are gone. src/tiered stays in the tree; this ticket only strips schema call sites.

Change

Delete __drop_tiered, __alter_tiered and related object/tier alter helpers, __truncate_tiered, and __schema_tiered_worker. Strip the URI dispatch that calls them. Those URIs should fail as an unexpected object type, not map to file:. Do not take schema_create.c / schema_open.c (WT-18470). Do not remove WT_TIERED / WT_DHANDLE_TYPE_TIERED / bstorage header fields. Do not change tests, docs, or src/tiered. Leave table/file tiered_storage= parse stubs.

Test

Ninja Debug build. cd dist && ./s_fast. python3 ../test/suite/run.py test_schema01 from build/. Do not run test_tiered*.