fix(sqlite): bound WAL sidecar growth

docs/automation/taskflow.md

@@ -116,6 +116,9 @@ Example: three independent cron jobs that together form a "morning ops" routine.
 ## Durable state and revision tracking
 
 Each flow persists its own state and tracks revisions so progress survives gateway restarts. Revision tracking enables conflict detection when multiple sources attempt to advance the same flow concurrently.
+The flow registry uses SQLite with bounded write-ahead-log maintenance, including
+periodic and shutdown checkpoints, so long-running gateways do not retain
+unbounded `registry.sqlite-wal` sidecar files.
 
 ## Cancel behavior
 

docs/automation/tasks.md

@@ -305,6 +305,8 @@ $OPENCLAW_STATE_DIR/tasks/runs.sqlite
 ```
 
 The registry loads into memory at gateway start and syncs writes to SQLite for durability across restarts.
+The Gateway keeps the SQLite write-ahead log bounded by using SQLite's default
+autocheckpoint threshold plus periodic and shutdown `TRUNCATE` checkpoints.
 
 ### Automatic maintenance