Problem

Removed tiered_storage / tiered_object keys still live on file_config / file_meta, so every new file metadata row would persist them. Those keys only need to remain on the create and connection-open APIs so leftover callers and WiredTiger.basecfg still parse. Stored file: metadata is not run through file.meta checks; getters ignore unknown keys.

Change

On tiered-depr (not develop — the keys are still live there):* Remove tiered_config from file_config and tiered_object from file_meta in dist/api_data.py.

• Keep the keys on WT_SESSION.create and wiredtiger_open / reconfigure. Create already lists tiered_config separately.
• Regenerate with dist/s_all.
• Do not add a persist-time strip as the solution. Collapse from file_meta will stop writing the keys; leftover rows still open; a later alter drops them on rewrite.

Test

• New table/file create, checkpoint, reopen, and alter: metadata must not contain tiered_storage= or tiered_object=.
• create(..., tiered_storage=(name=none)) still succeeds; name other than none is still ENOTSUP.
• Leftover file: metadata that still contains the keys must still open.