Records that the SharedSchema resolver is fully consumed at deploy, runtime and in
the UI value-entry forms, but has no authoring path: SchemaBuilder is the only
schema editor on all four surfaces and offers no library-reference option, so the
page creates entries nothing can point at. SchemaBuilder also collapses a $ref it
is shown to {"type":"string"} — currently unreachable, since no ref exists and
there is no UI or CLI to make one, but a trap for the first one authored.
Includes live usage counts (zero entries, zero refs, both environments) and the
resulting recommendation: leave dormant with a trigger, rather than finish or
delete it now.