feat(loop): Top5#4 工具循环增强（对齐 OpenClaw agent-loop）——重复检测/并行串行/钩子/errorKind/repair

- 重复调用安全网（critical-tool-loop）：指纹=name+canonical JSON(args)；批内重复第二次跳过回喂
  「duplicate call」；跨轮关键重复(同指纹重现)→首次 block+criticalSeen，再次连续重复→终止整轮
  StopReasonToolLoopTerminated（替代裸 8 轮针对同调用的硬截止）。
- 并行/串行混合：invokeParallel 默认并行，信号量(ToolParallelism 默认4)限并发，结果按调用索引
  写回按原序渲染；串行触发=Options.ToolExecution:sequential 或 SetToolExecutionMode(name,sequential)
  （对齐 OpenClaw「一个 sequential 标记→整组串行」）；goroutine 不泄漏、ctx 取消快速返回。
- 工具钩子：ToolLoopHooks(BatchAdmit/CallAdmit/AfterCall/AfterOutcome) 经 Options.Hooks 注入，
  均 nil-tolerant；供后续敏感操作代审复用（design/11）。terminate 用 every 语义。
- status 分类：ToolError.Kind() 区分 argument-validation(JSON-Schema 失败)/execution；
  失败消息渲染 {kind,message} 让模型区分重发参数 vs 执行失败。
- tool-call-repair：LenientJSONUnmarshal 修 fence 包裹/尾逗号畸形；agent.extractToolCalls 与
  loop.decodeToolCalls 走它；不可修复退化为文本不崩整轮。意图调用未区分回喂提示(后置)。
- tool_execution_update：流式路径 emitToolExecution 发 StreamKindToolExecution(start/end/end:error)。

go build/vet/test 全绿(46包)。TestRun_MaxRounds 改每轮不同参(原同 echo 被安全网拦，预期新行为)。
-race 受宿主 TSan VMA 限制无法运行(与代码无关)。

internal/runtime/loop/options.go

@@ -52,6 +52,16 @@ type Options struct {
 	// forwarded to this callback (model.StreamEvent), so the frontend can render
 	// body text, tool calls and (eventually) reasoning segments independently.
 	OnStream func(model.StreamEvent)
+	// ToolExecution selects how a batch of tool calls is run: "parallel" (the
+	// default) or "sequential". Empty means parallel.
+	ToolExecution string
+	// ToolParallelism caps how many tool calls run concurrently when ToolExecution
+	// is "parallel". Non-positive selects DefaultToolParallelism (4).
+	ToolParallelism int
+	// Hooks installs optional per-batch/per-call tool-loop hooks. Every field is
+	// nil-tolerant; these are reserved for "敏感操作代审" (design/11) and the
+	// future asynchronous-tool path. A zero Hooks value is a no-op.
+	Hooks ToolLoopHooks
 	// Log is the base logger. Nil is replaced with a discard logger tagged with
 	// source "runtime/loop".
 	Log *slog.Logger