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The emit-shaped hook points (SessionStart, SubagentStart, SubagentStop) run fire-and-forget: no seam awaits the run chain, so disposing a bridge could strand a live hook process and let a late continuation inject into a disposed context. The floating continuation also made the coverage gate racy: the only coverage of the SubagentStart continuation's no-context branch arm rode on an un-awaited .then, and on a loaded CI runner the fork's per-file coverage snapshot beat it — master run 28798191671 failed the 100% branch gate on hooks-claude/src/index.ts at 99.03% (uncovered line 336) with the identical tree passing the PR run three minutes earlier. New shared primitive createDetachedRuns() in dsh-hook-protocol: a bridge tracks each detached run chain, passes the tracker's abort signal to runHook, and registers drain() as its effect disposer — drain aborts still-running hook processes (a kill via the bash seam, not a wait out to the 10-minute default hook timeout), then resolves once every chain has settled. fiber.dispose() resolving now means the bridge's detached work is quiescent (docs/defensive-patterns.md). The subagent marker test disposes the bridge as its sync point, so the formerly racy branch arm is executed deterministically before the file's coverage snapshot; new tests pin abort-on-dispose promptness for both bridges and the tracker's settle/drain contract in hook-protocol.