fix: allow memory flush model override

docs/concepts/compaction.md

@@ -132,7 +132,23 @@ By default, compaction runs silently. Set `notifyUser` to show brief status mess
 
 ### Memory flush
 
-Before compaction, OpenClaw can run a **silent memory flush** turn to store durable notes to disk. See [Memory](/concepts/memory) for details and config.
+Before compaction, OpenClaw can run a **silent memory flush** turn to store durable notes to disk. Set `agents.defaults.compaction.memoryFlush.model` when this housekeeping turn should use a local model instead of the active conversation model:
+
+```json
+{
+  "agents": {
+    "defaults": {
+      "compaction": {
+        "memoryFlush": {
+          "model": "ollama/qwen3:8b"
+        }
+      }
+    }
+  }
+}
+```
+
+The memory-flush model override is exact and does not inherit the active session fallback chain. See [Memory](/concepts/memory) for details and config.
 
 ## Pluggable compaction providers
 

docs/concepts/memory.md

@@ -110,6 +110,26 @@ Before [compaction](/concepts/compaction) summarizes your conversation, OpenClaw
 runs a silent turn that reminds the agent to save important context to memory
 files. This is on by default — you do not need to configure anything.
 
+To keep that housekeeping turn on a local model, set an exact memory-flush model
+override:
+
+```json
+{
+  "agents": {
+    "defaults": {
+      "compaction": {
+        "memoryFlush": {
+          "model": "ollama/qwen3:8b"
+        }
+      }
+    }
+  }
+}
+```
+
+The override applies only to the memory-flush turn and does not inherit the
+active session fallback chain.
+
 <Tip>
 The memory flush prevents context loss during compaction. If your agent has
 important facts in the conversation that are not yet written to a file, they