BC-065C — EventPlatform / M12 Consolidation

Status: HISTORICAL For the current architecture, see: ./dependances.md.

Status

BC-065C completed.

No plugin file changed. No runtime mirror file changed. No Composer change. No runtime sync.

Decision

Retained option: B.

• CMonChoix\Application\EventPlatform\... remains the active canonical legacy family for this slice.
• CMonChoix\Application\M12\... remains a compatibility wrapper family.
• no Projection or Realtime class is moved in this tranche.

Real issue fixed

BC-065A documented the M12 wrappers as active compatibility surfaces:

• src/Application/M12/EventBus/EventBus.php
• src/Application/M12/Wiring/PlatformKernel.php

But both wrappers extended classes declared final:

• src/Application/EventPlatform/Bus/EventBus.php
• src/Application/EventPlatform/Kernel/PlatformKernel.php

Loading the wrappers therefore produced a fatal compatibility error.

BC-065C fixes only that incompatibility by restoring wrapper-safe inheritance on the two canonical EventPlatform classes.

Consolidated classification

Class	Role	Status
EventPlatform\Bus\EventBus	active in-memory bus	retained canonical legacy type
EventPlatform\Bus\EventDispatcher	thin delegate to EventBus	retained, no proven consumer
EventPlatform\Contracts\Event	marker contract	retained, no proven consumer
EventPlatform\Contracts\EventHandler	callable contract	retained, no proven consumer
EventPlatform\Kernel\PlatformKernel	lightweight wiring shell	retained canonical legacy type
M12\EventBus\EventBus	wrapper over EventPlatform bus	retained compatibility wrapper
M12\Wiring\PlatformKernel	wrapper over EventPlatform kernel	retained compatibility wrapper

Behavior certification

EventBus behavior remained unchanged:

• same subscribe(string, callable): void
• same publish(object): void
• same handler ordering
• same duplicate registration behavior
• same no-op when no handler is registered
• same exception propagation

Reflection / compatibility

After BC-065C:

• M12 wrappers can be loaded without fatal error;
• M12\EventBus\EventBus instanceof EventPlatform\Bus\EventBus remains true;
• M12\Wiring\PlatformKernel instanceof EventPlatform\Kernel\PlatformKernel remains true;
• no method signature changed.

Deferred debt

Still deferred to later BCs:

• EventPlatform\EventDispatcher
• EventPlatform\Contracts\Event
• EventPlatform\Contracts\EventHandler
• Projection legacy shells
• Realtime legacy shells

BC-065E final certification closes BC-065 while keeping the remaining non-critical residual debt explicitly documented as P2 only.