Rename persist_and_broadcast to record_platform_event

After record_event became the primitive for INSERT + broadcast + tracing,
persist_and_broadcast no longer persists or broadcasts directly — it
translates a PlatformEvent into an EventInsert and delegates. The new
name makes the layering explicit (record_event is the primitive,
record_platform_event is the PlatformEvent translator).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/plc_platform_core/src/event.rs

@@ -161,8 +161,8 @@ pub async fn record_event(
     }
 }
 
-/// Persists platform events to the `event` table and broadcasts via WebSocket.
-pub async fn persist_and_broadcast(
+/// Translates a PlatformEvent to an EventInsert and delegates to record_event.
+pub async fn record_platform_event(
     event: &PlatformEvent,
     pool: &sqlx::PgPool,
     ws_manager: &WebSocketManager,

crates/plc_platform_core/src/platform_context.rs

@@ -35,7 +35,7 @@ impl PlatformContext {
         let cm = self.connection_manager.clone();
         tokio::spawn(async move {
             // Persist + broadcast.
-            crate::event::persist_and_broadcast(&event, &pool, &ws_manager).await;
+            crate::event::record_platform_event(&event, &pool, &ws_manager).await;
 
             // Connection management side effects.
             match &event {