feat(event-dispatcher): unify event dispatch via EventInterface trait

Extract a superclass-trait EventInterface from the base Event.

pool_builder's PrePoolCreateEvent stays deferred: its constructor needs
owned, non-cloneable Request and repository boxes the builder only holds
by reference (owned-payload blocker). The event is plugin-only, so its
construction is re-tagged TODO(plugin).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/crates/shirabe/src/installer/installer_event.rs b/crates/shirabe/src/installer/installer_event.rs
index 5adde1c..ca0be22 100644
--- a/crates/shirabe/src/installer/installer_event.rs
+++ b/crates/shirabe/src/installer/installer_event.rs
@@ -1,8 +1,12 @@
 //! ref: composer/src/Composer/Installer/InstallerEvent.php
 
+use indexmap::IndexMap;
+use shirabe_php_shim::PhpMixed;
+
 use crate::composer::ComposerWeakHandle;
 use crate::dependency_resolver::Transaction;
 use crate::event_dispatcher::Event;
+use crate::event_dispatcher::EventInterface;
 use crate::io::IOInterface;
 
 #[derive(Debug)]
@@ -55,3 +59,25 @@ impl InstallerEvent {
         Some(&self.transaction)
     }
 }
+
+impl EventInterface for InstallerEvent {
+    fn get_name(&self) -> &str {
+        self.inner.get_name()
+    }
+
+    fn get_arguments(&self) -> &Vec<String> {
+        self.inner.get_arguments()
+    }
+
+    fn get_flags(&self) -> &IndexMap<String, PhpMixed> {
+        self.inner.get_flags()
+    }
+
+    fn is_propagation_stopped(&self) -> bool {
+        self.inner.is_propagation_stopped()
+    }
+
+    fn stop_propagation(&mut self) {
+        self.inner.stop_propagation();
+    }
+}
diff --git a/crates/shirabe/src/installer/package_event.rs b/crates/shirabe/src/installer/package_event.rs
index 17f9113..6661e0d 100644
--- a/crates/shirabe/src/installer/package_event.rs
+++ b/crates/shirabe/src/installer/package_event.rs
@@ -3,9 +3,11 @@
 use crate::composer::ComposerWeakHandle;
 use crate::dependency_resolver::operation::OperationInterface;
 use crate::event_dispatcher::Event;
+use crate::event_dispatcher::EventInterface;
 use crate::io::IOInterface;
 use crate::repository::RepositoryInterface;
 use indexmap::IndexMap;
+use shirabe_php_shim::PhpMixed;
 
 #[derive(Debug)]
 pub struct PackageEvent {
@@ -67,3 +69,25 @@ impl PackageEvent {
         self.operation.as_ref()
     }
 }
+
+impl EventInterface for PackageEvent {
+    fn get_name(&self) -> &str {
+        self.inner.get_name()
+    }
+
+    fn get_arguments(&self) -> &Vec<String> {
+        self.inner.get_arguments()
+    }
+
+    fn get_flags(&self) -> &IndexMap<String, PhpMixed> {
+        self.inner.get_flags()
+    }
+
+    fn is_propagation_stopped(&self) -> bool {
+        self.inner.is_propagation_stopped()
+    }
+
+    fn stop_propagation(&mut self) {
+        self.inner.stop_propagation();
+    }
+}