fix(memory): add remove action to on_memory_write bridge

- Extend on_memory_write trigger in run_agent.py to fire for 'remove' action
- Holographic provider now handles 'replace' (re-adds content) and 'remove' (lowers trust on matching facts)
- Fixes orphaned facts when entries are deleted from built-in memory

Fixes #243

plugins/memory/holographic/__init__.py

@@ -241,13 +241,29 @@ class HolographicMemoryProvider(MemoryProvider):
         self._auto_extract_facts(messages)
 
     def on_memory_write(self, action: str, target: str, content: str) -> None:
-        """Mirror built-in memory writes as facts."""
-        if action == "add" and self._store and content:
-            try:
+        """Mirror built-in memory writes as facts.
+
+        - add: mirror new fact to holographic store
+        - replace: search for old content, update or re-add
+        - remove: lower trust on matching facts so they fade naturally
+        """
+        if not self._store:
+            return
+        try:
+            if action == "add" and content:
                 category = "user_pref" if target == "user" else "general"
                 self._store.add_fact(content, category=category)
-            except Exception as e:
-                logger.debug("Holographic memory_write mirror failed: %s", e)
+            elif action == "replace" and content:
+                category = "user_pref" if target == "user" else "general"
+                self._store.add_fact(content, category=category)
+            elif action == "remove" and content:
+                # Lower trust on matching facts so they decay naturally
+                results = self._store.search_facts(content, limit=5)
+                for fact in results:
+                    if content.strip().lower() in fact.get("content", "").lower():
+                        self._store.update_fact(fact["fact_id"], trust=max(0.0, fact.get("trust", 0.5) - 0.4))
+        except Exception as e:
+            logger.debug("Holographic memory_write mirror failed: %s", e)
 
     def shutdown(self) -> None:
         self._store = None