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diag(ui): 记录 Node 期限瞬间的子进程状态 (#144) - #241
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The node fixture now uses Popen so a timeout reports spawn_seconds, pid, exit_at_timeout and partial_stdout_bytes alongside the preload checkpoint.
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给 #144 的 Node 夹具补上期限瞬间的子进程状态（与 #40 的夹具一致的思路，但不改 10 秒期限）：
Popen+communicate(timeout=10)，记录spawn_seconds（Popen返回到 communicate 开始之间的父进程耗时）；pid、spawn_seconds、exit_at_timeout（poll()，None= 仍在运行）、partial_stdout_bytes；OSError，例如进程无法创建）单独给出node fixture could not be created: …。这样下一次命中时可直接区分三种情形：
OSErrorspawn_seconds很大exit_at_timeout=None验证
python -m unittest research.ui.test_raster_style_reference→ 11 tests OK（顺带补上漏掉的import time）。边界
spawn_seconds只是Popen到communicate之间的差值，不等于完整创建耗时，仅作相对指示。Refs #144