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Garry TanandClaude Fable 5
2e53b18670
All three provider runners (claude/codex/gemini) killed only the direct child on timeout: tool subprocesses the CLI spawned survived as orphans holding our pipes open and burning shared API rate (observed: a 600s timeout stretching past 1400s; a stalled run once burned a core for 15 hours). gstack-detach's watchdog had the same shape one level up — killpg SIGTERM, 5s grace, then a direct-child proc.kill() that orphaned grandchildren. Fix: spawn provider children via node:child_process with detached (own process group) and killProcessGroup(SIGKILL) in the timeout handler — runShardChild's proven pattern, EPERM/ESRCH fallbacks included. The codex and gemini copies also gain the reader.cancel() + stderr Promise.race hardening only the claude copy had (they still carried the blocked-drain hang it fixed). gstack-detach's watchdog now group-SIGKILLs after the grace. Regression net: test/session-runner-groupkill.test.ts drives the REAL runSkillTest against a fake claude shim (PATH override) that spawns a grandchild and wedges — the run must classify timeout within budget and leave neither shim nor grandchild alive — plus source pins on all three runners (detached + killProcessGroup, no bare timeout kill, no Bun.spawn reversion). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>