Module extensions 

Extension hooks shared across patterns.

Two flavors:

1. Named slots — typed closures that the framework runs at well-known points (on_command, on_event). These can fail and surface a crate::PatternError.
2. Generic taps — fire-and-forget tokio::sync::mpsc senders that receive a clone of every command/event. Use these to bridge into atomr_streams without coupling the pattern surface to a specific Source/Sink shape.

Structs

ExtensionSlots

Bundle of extension hooks. Reused by every pattern that wants to let users plug in their own actors / sinks at well-known points.

Type Aliases

CommandInterceptor

A pre-handler interceptor. Receives the command by reference; may reject it (turns into PatternError::Intercepted).

EventListener

A post-persist event listener. Synchronous; fast hooks only — for async work, push events into a tap channel and react out-of-band.