⭐ IntegrationEventLogEF

Done. All 7 source files added and reviewed; tests/IntegrationEventLogEF.UnitTests covers all 5 applicable files, 17 passing tests.

IntegrationEventLogEF is the EF Core-backed transactional outbox for integration events — persisted alongside the business write in the same database transaction, then published separately. Notable findings across the full review:

• EventStateEnum renamed to EventState — Microsoft's own .NET naming guidelines say not to suffix enum type names with Enum, a guideline this file violated in Microsoft's own sample. Its explicit integer values are pinned by a dedicated test, since they're persisted to a Postgres column through the outbox pattern.
• The exact as-cast-can-return-null bug already fixed once in RabbitMQEventBus.DeserializeMessage recurred in IntegrationEventLogEntry.cs's own JSON deserialization — caught the second time because the first fix was still fresh.
• Services/IntegrationEventLogService.cs (added after a deliberate pause to build out the testing strategy first): the interface's method got renamed/retyped to match a fork-internal-consistency fix made when IIntegrationEventLogService was first reviewed, Assembly.GetEntryAssembly() got null-checked, and a genuinely pointless Assembly.Load(assembly.FullName) re-resolution got removed.
• IntegrationEventTypeResolver extracted from that service while writing its tests: the event-type-resolution logic (reflection-scan the entry assembly, match by short type name) was private static inside a generic class, recomputing per closed generic type despite not depending on the type parameter at all — and its hard dependency on Assembly.GetEntryAssembly() made a new collision-detection branch (two event types sharing a short name) untestable in isolation. Split into its own pure, non-generic class; closes a real silent-collision bug in the process (two colliding event types would have silently picked the first match).
• A real dependency conflict surfaced trying to restore Identity.API later: Duende.IdentityServer.EntityFramework.Storage was pinned below what a sibling package required — unrelated to this project directly, but found because IntegrationEventLogEF's EF Core packages share the same central version file.

Full detail and commit hashes in todo.md's IntegrationEventLogEF and IntegrationEventLogEF.UnitTests sections.