Fix stdio client shutdown bugs and rebuild the stdio test suite#2773

Open

maxisbey wants to merge 3 commits into

mainfrom

maxisbey/deflake-stdio-tests

Commits on Jun 3, 2026

Replace wall-clock margins in stdio cleanup tests with kernel-level signals
maxisbey
committed
Fix stdio client shutdown: cancellation deadlock, orphaned children, spurious kills
maxisbey
committed
Consolidate stdio tests: in-process logic tests, minimal real-process set
maxisbey
committed