grep_files runs its directory walk and per-file regex synchronously inside
the async execute(). On a large tree this pins the runtime worker for
minutes, so the turn loop can't observe the cancel token and the stop
button stays unresponsive — the same failure file_search fixed in #2035.
Mirror that fix: move the blocking walk onto spawn_blocking, bounded by a
30s hard timeout with a biased select on the cancel token, via a
run_blocking_grep helper that parallels run_blocking_file_search. Output
and the existing per-file/per-line cancel checks are unchanged.
Co-authored-by: hexin <he.xin@h3c.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
hexin
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