fix(tasks): 任务队列 - 限制缓存回源并修复并发租约与过期写入

.gitignore

@@ -14,6 +14,10 @@ docs/content/docs/*
 !docs/content/docs/plugins/
 docs/content/docs/plugins/*
 !docs/content/docs/plugins/ai-art-critique.mdx
+# Keep the task stability runbook versioned without unignoring generated docs.
+!docs/content/docs/backend/
+docs/content/docs/backend/*
+!docs/content/docs/backend/task-runtime-stability.mdx
 .env*
 !.env.example
 data/