fix(web): support parallel sessions; fix lost/duplicate in-flight replies

agent/evolution/executor.py

@@ -269,7 +269,9 @@ def run_evolution_for_session(
         new_messages = all_messages[done:]
         transcript = _build_transcript(new_messages)
         if not transcript.strip():
-            logger.info(f"[Evolution] session={session_id}: no new messages, skip")
+            # Routine no-op: the per-minute scan hits every idle session, so keep
+            # this at debug to avoid spamming the log.
+            logger.debug(f"[Evolution] session={session_id}: no new messages, skip")
             # Advance the cursor anyway so we don't re-scan the same tail.
             agent._evo_done_msg_count = total_msgs
             return False

agent/evolution/prompts.py

@@ -120,11 +120,12 @@ them. When their signal is clear, act; do not be shy here.
 
 - Nothing worth evolving -> output exactly `[SILENT]` and nothing else.
 - Otherwise, after performing the edits, output a short user-facing summary in
-  the SAME LANGUAGE the user used in the conversation. Tell the user, briefly:
+  the SAME LANGUAGE the user used. Write it for an ordinary user, in plain
+  everyday words — NOT a developer report. No need to expose internal details
+  (file names/paths, system mechanics, etc.). Tell the user, briefly:
     1) that you just did a self-learning pass,
-    2) what you learned and what you changed (in plain terms — no need to cite
-       exact file paths; "remembered X" / "improved the weekly-report skill" is
-       enough).
+    2) what you learned and what you changed in THIS pass ("remembered X" /
+       "improved the <name> skill" / "finished <task>").
   Keep it to 1-3 lines. Generic shape (do not copy domain words):
     "I just did a self-learning pass.
      - Learned: <what you learned>