feat(loop): wire speak tool into the loop (M57)

- speak_tool.go: the speak tool itself — rune-derived timeout budget, structured
  failure codes, persona/emotion stamped on the synthesis ctx, audio persisted
  through the store seam, structured result for the model.
- voice_deps.go: the wiring seam (VoiceSynth / VoiceStore + VoiceStoreFunc
  adapter), voiceEnabled, withSpeakSpec (appended after every schema shrink),
  and captureVoice (success beats failure, last one wins).
- options.go / loop.go: VoiceSynth, VoiceStore, SpeakBudget injection points.
- request.go: advertise speak on both toolSchemas return paths.
- tools.go / tools_invoke.go: carry the batch voice outcome; split invokeOne /
  emitToolExecution / spanStatusForToolPhase / invokeParallel into their own
  file (tools.go was at the 500-line ceiling) and let speak run without a
  dispatcher.
- run.go: keep the voice outcome across tool batches (a later batch without
  speak must not erase it).

Known, deliberate: speak bypasses the capacity allow-set and skill-round
narrowing (it belongs to no built-in toolset), so it is also advertised in
quiet/awake; execution still passes the tool security gate, where speak is not
registered and non-owner actors are denied fail-closed.

internal/runtime/loop/options.go

@@ -214,6 +214,15 @@ type Options struct {
 	// 或重排模型所见的消息。它是循环中与
 	// OpenClaw 的 transformContext 等价之物（design §1.3）。为 nil = 不做投影。
 	TransformContext func(ctx context.Context, messages []model.Message, round int) []model.Message
+	// VoiceSynth 与 VoiceStore 一起接线时（**两个都非 nil**），循环向模型
+	// 广告 speak 工具（M57）：她可以自己决定这一条回复用语音还是文本。
+	// 任一为 nil = 不广告、speak 不可调用，模型面与接线前逐字节一致。
+	VoiceSynth VoiceSynth
+	VoiceStore VoiceStore
+	// SpeakBudget 可替换 speak 的超时预算公式（文本 rune 数 → 毫秒）。
+	// 为 nil 或返回值非正时回落内置公式 speakBudgetMs。它是给测试与
+	// 部署调优用的注入点，不是能力开关（开关是上面两个依赖）。
+	SpeakBudget func(runes int) int
 	// Log 是基础 logger。为 nil 时替换为标记来源
 	// "runtime/loop" 的丢弃 logger。
 	Log *slog.Logger