huskies: merge 1126 story Gateway event aggregator with per-session scope filters (Timmy=All, Sally=single sled)

server/src/service/gateway/mod.rs

@@ -613,6 +613,12 @@ pub async fn init_project(
 
 /// Broadcast a status event received from a project node to all local subscribers.
 ///
+/// For [`crate::service::events::StoredEvent::StageTransition`] events the
+/// transition is also appended to the gateway's CRDT event log using the
+/// project name as the `sled_id`.  This builds the live tail-merged aggregate
+/// view that [`crate::crdt_state::assemble_and_advance_session`] reads when a
+/// session's [`crate::crdt_state::ScopeFilter`] is set to `All`.
+///
 /// Returns the number of active receivers that received the event.
 /// A return value of zero means no subscribers are currently connected.
 pub fn broadcast_status_event(
@@ -620,6 +626,26 @@ pub fn broadcast_status_event(
     project: String,
     event: crate::service::events::StoredEvent,
 ) -> usize {
+    // Append StageTransition events to the gateway CRDT so the session
+    // assembler can deliver a unified cross-sled event stream.
+    if let crate::service::events::StoredEvent::StageTransition {
+        ref story_id,
+        ref from_stage,
+        ref to_stage,
+        timestamp_ms,
+        ..
+    } = event
+    {
+        let timestamp_secs = timestamp_ms as f64 / 1_000.0_f64;
+        crate::crdt_state::append_event_log_entry(
+            &project,
+            timestamp_secs,
+            story_id,
+            from_stage,
+            to_stage,
+            "StageTransition",
+        );
+    }
     let msg = GatewayStatusEvent { project, event };
     state.event_tx.send(msg).unwrap_or(0)
 }