fix(swqos): extend parallel-submit wait/grace windows for late HTTP responses
- Scale primary submit timeout with configured channel count (clamped 3–5s)
- After primary expiry, optionally poll longer so slow providers still land before drain
- Short settle sleeps to reduce counter vs TaskResult races and dropped signatures when
wait_transaction_confirmed is false
Co-authored-by: Cursor <cursoragent@cursor.com>
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