Why: the dual-speed slow lane shipped as an observable capability plus soft
prompt guidance, but on the real (non-mock) path models routinely grind
through heavy document tasks synchronously for minutes with zero user-visible
output - the pattern only engages when the model happens to think of it.
Evidence: five new unit tests over an injected clock cover fire-after-threshold,
quiet-before-threshold, disabled-by-setting, and the replied/delegated guard
paths (reminders observed in the captured kernel requests); full go test
./... 32 pkgs green. Real-model run recorded in the Dev task card.
Impact: runDirect tracks run start, user-reply, and background-delegation
state; reminders() injects a one-shot dual-speed nudge (SR-B10) once elapsed
time crosses runtime.dualSpeedNudgeSeconds (default 75s, 0 disables) while
the user has neither a reply nor a background lane. New setting registered.
Refs: Dev task feature/dual-speed-real-path; SR-B10 (RDM requirements/01 V2.1).
Why: the round-6 real-model dual-speed run showed MiniMax writing its
reasoning as inline <think> blocks; finishChild's partsText fed them into
the background notice turn and the inbox result card verbatim.
Evidence: new runmgr test covers closed-block stripping with body preserved
and conservative handling of unclosed blocks; go test ./... 32 pkgs green.
Impact: partsText removes closed <think>...</think> spans before summary,
notice, and card assembly; unclosed blocks are kept as-is.
Refs: Dev task feature/dual-speed-real-path.
Why: the round-6 real-model dual-speed run showed MiniMax writing its
reasoning as inline <think> blocks; finishChild's partsText fed them into
the background notice turn and the inbox result card verbatim.
Evidence: new runmgr test covers closed-block stripping with body preserved
and conservative handling of unclosed blocks; go test ./... 32 pkgs green.
Impact: partsText removes closed <think>...</think> spans before summary,
notice, and card assembly; unclosed blocks are kept as-is.
Refs: Dev task feature/dual-speed-real-path.
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Why: 用户指令「将快慢双速通道接入实际 Agent-Native，不要使用 Mock」——此前双速只有软性提示词，实测 MiniMax 对重文档任务一律同步长跑 150-192s、用户全程零反馈；中途 system-reminder 单次注入也被无视。
改动：
Evidence: go test ./... 32 包全绿（新增 8 测：阈值触发/未到阈值/关闭/已答复/已委派/升级重复/入口前置三态/think 剥离）；真实模型对照（MiniMax 同任务 6 轮）：BEFORE 4 轮全部同步直跑（提醒 77-105s 注入日志实证、模型无视）；AFTER 第 6 轮 t+48s 委派后台、t+64s 用户收到即时反馈、进度卡 done/ok、通知回投、终稿干净。
Refs: Dev 任务 feature/dual-speed-real-path；SR-B10（RDM requirements/01 V2.1）。