memory: add audit log events

crates/protocol/src/lib.rs

@@ -425,6 +425,11 @@ pub enum Event {
         result: serde_json::Value,
     },
     Alert(Alert),
+    /// Latest memory extract/consolidation lifecycle event for UI observability.
+    ///
+    /// This is not part of LLM history or prompt context; clients may display it
+    /// briefly as operational status.
+    MemoryWorker(MemoryWorkerEvent),
     /// Pod has started compacting the current session.
     ///
     /// Fired immediately before a compaction run. Success is signalled by
@@ -460,6 +465,19 @@ pub struct Alert {
     pub timestamp_ms: i64,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct MemoryWorkerEvent {
+    pub worker: String,
+    pub status: String,
+    pub run_id: String,
+    pub trigger: String,
+    pub reason: String,
+    /// Human-readable compact form for actionbar rendering.
+    pub message: String,
+    /// Milliseconds since the Unix epoch.
+    pub timestamp_ms: i64,
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum AlertLevel {