Cross-plugin FK blocker ADR-013 cited is already resolved: the FKs into
machines were held only by dead legacy tables (machinerelationships,
printerdata, installedapps, communications.machineid) that existing
migrations 7a01/7c01 already drop. No live plugin table hard-FKs another
plugin. Schema-lean is unblocked.
Enabling change: create_plugin_tables now skips already-existing tables
(idempotent) so a plugin anchor can create its tables on a fresh lean
install and no-op on a database that has them from the pre-cutover
baseline. The load-bearing baseline lift is staged as ADR-014 Phase 2.
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