fix(memory): stop autosaving assistant summaries and filter legacy entries

src/memory/mod.rs

@@ -75,6 +75,13 @@ pub fn effective_memory_backend_name(
     memory_backend.trim().to_ascii_lowercase()
 }
 
+/// Legacy auto-save key used for model-authored assistant summaries.
+/// These entries are treated as untrusted context and should not be re-injected.
+pub fn is_assistant_autosave_key(key: &str) -> bool {
+    let normalized = key.trim().to_ascii_lowercase();
+    normalized == "assistant_resp" || normalized.starts_with("assistant_resp_")
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 struct ResolvedEmbeddingConfig {
     provider: String,
@@ -343,6 +350,15 @@ mod tests {
         assert_eq!(mem.name(), "sqlite");
     }
 
+    #[test]
+    fn assistant_autosave_key_detection_matches_legacy_patterns() {
+        assert!(is_assistant_autosave_key("assistant_resp"));
+        assert!(is_assistant_autosave_key("assistant_resp_1234"));
+        assert!(is_assistant_autosave_key("ASSISTANT_RESP_abcd"));
+        assert!(!is_assistant_autosave_key("assistant_response"));
+        assert!(!is_assistant_autosave_key("user_msg_1234"));
+    }
+
     #[test]
     fn factory_markdown() {
         let tmp = TempDir::new().unwrap();