A managed block missing its end marker was treated as Orca-owned through EOF,
so uninstall/reinstall deleted appended user tables. The same shape existed a
second time in the Codex legacy profile cleanup.
Ownership is now two separate claims: a marker pair proves extent, and a
provider that can recognize its own emitted tables owns them wherever they
sit. An orphaned marker owns only its own line. Recognition uses the same
test for remove, install and status, so a table Orca cannot see is never one
it leaves running.
Co-authored-by: maoking <secretxierluo@gmail.com>
Fixes#18861
Neilandmaoking
47391f9535