Persistence Portability

Panache is isolated to the persistence plugin surface and does not leak broadly into framework/runtime/src/main.

Current SPI state:

PersistenceProvider<T> returns Uni<T>.
ExecutionStateStore and Await*Store contracts are Mutiny-oriented and live beside existing provider implementations.
Store providers are present in plugin modules, not only runtime core.

Proposed migration:

Move core interfaces to neutral async types (CompletionStage / Publisher boundary as needed).
Keep provider implementations in framework-specific modules.

Proposed modules:

tpf-store-core
tpf-store-inmemory
tpf-store-dynamo
tpf-store-quarkus-hibernate-reactive
tpf-store-spring-r2dbc