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joshsiv-mulga
4b55247819
Move engine identity and validation, the per-engine parameter catalogues, effective-parameter resolution, db.* instance classes and engine/orderable selection into an engine package. Behaviour, error codes and ordering are unchanged. The package imports no EC2 package: instance-class memory comes from an immutable Sizing value built from an engine-declared InstanceTypes interface, backed by the fixed instance-type table in handlers/rds. Effective parameters leave as an engine-owned Setting, converted to Parameter in handlers/rds. AWS output building, paging, apply-method mapping, storage limits and the gateway runnable check stay in the adapter path. The RDS agent declares its own EngineCatalog interface and types and receives an engine-backed implementation from cmd/rds-agent, so agent code does not import the catalogue. Cross-engine tests use the two real engines instead of a registered fake.