Adapter module implementing the evoq_event_store contract.

Configured into evoq via:

  application:set_env(evoq, event_store_adapter, mem_evoq_adapter).

Every callback looks up the store pid in mem_evoq_registry and forwards via gen_server:call/2. The store itself (mem_evoq_store) holds the actual state.

This module is the public stable surface. The store gen_server's callback contract may evolve internally; the adapter's exports must not change without bumping the package's major version.