huskies: merge 1128 story Bounded event queues + EventStreamGap sentinel + observability for context assembly

server/src/llm_session/mod.rs

@@ -15,6 +15,10 @@
 /// events or the CRDT is not yet initialised.
 pub fn assemble_prompt_context(session_id: &str) -> String {
     let lines = crate::crdt_state::assemble_and_advance_session(session_id);
+    let event_count = lines.len();
+    crate::slog!(
+        "[llm-session] assemble_prompt_context session={session_id} new_events={event_count}"
+    );
     if lines.is_empty() {
         return String::new();
     }