burn: add remove action to on_memory_write bridge

Extends the memory bridge to fire on_memory_write for the 'remove'
action in addition to 'add' and 'replace'. The holographic provider
now searches for matching facts and lowers trust by 0.4 on remove,
allowing orphaned facts to decay naturally.

Fixes #277

plugins/memory/holographic/__init__.py

@@ -248,6 +248,25 @@ class HolographicMemoryProvider(MemoryProvider):
                 self._store.add_fact(content, category=category)
             except Exception as e:
                 logger.debug("Holographic memory_write mirror failed: %s", e)
+        elif action == "remove" and self._store and content:
+            try:
+                # Search for matching facts and lower trust so they decay naturally
+                facts = self._store.search_facts(content, limit=5)
+                for fact in facts:
+                    self._store.update_fact(fact["fact_id"], trust_delta=-0.4)
+                    logger.debug(
+                        "Holographic remove: decayed trust for fact %s: %s",
+                        fact["fact_id"], fact["content"][:60],
+                    )
+            except Exception as e:
+                logger.debug("Holographic memory_write remove failed: %s", e)
+        elif action == "replace" and self._store and content:
+            try:
+                # Re-add the new content as a fresh fact
+                category = "user_pref" if target == "user" else "general"
+                self._store.add_fact(content, category=category)
+            except Exception as e:
+                logger.debug("Holographic memory_write replace failed: %s", e)
 
     def shutdown(self) -> None:
         self._store = None

run_agent.py

@@ -6086,12 +6086,16 @@ class AIAgent:
                 store=self._memory_store,
             )
             # Bridge: notify external memory provider of built-in memory writes
-            if self._memory_manager and function_args.get("action") in ("add", "replace"):
+            if self._memory_manager and function_args.get("action") in ("add", "replace", "remove"):
                 try:
+                    # For remove, use old_text as the searchable content
+                    bridge_content = function_args.get("content", "")
+                    if not bridge_content and function_args.get("action") == "remove":
+                        bridge_content = function_args.get("old_text", "")
                     self._memory_manager.on_memory_write(
                         function_args.get("action", ""),
                         target,
-                        function_args.get("content", ""),
+                        bridge_content,
                     )
                 except Exception:
                     pass