story-kit: merge 262_story_bot_error_notifications_for_story_failures

server/src/io/watcher.rs

@@ -50,6 +50,14 @@ pub enum WatcherEvent {
     /// Triggers a pipeline state refresh so the frontend can update agent
     /// assignments without waiting for a filesystem event.
     AgentStateChanged,
+    /// A story encountered a failure (e.g. merge failure).
+    /// Triggers an error notification to configured Matrix rooms.
+    MergeFailure {
+        /// Work item ID (e.g. `"42_story_my_feature"`).
+        story_id: String,
+        /// Human-readable description of the failure.
+        reason: String,
+    },
 }
 
 /// Return `true` if `path` is the root-level `.story_kit/project.toml`, i.e.