Parent agent cancellation does not cancel subagents

[exedev-shelley]

Author: winterqt
Channel: #shelley
Link: https://discord.com/channels/1405685085923049482/1450334528210993295/1489372414017142886

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Issue

Cancelling a parent agent does not cancel its subagents.

Context

During testing, it was observed that Shelley can start multiple subagents concurrently. When a parent agent is cancelled, the subagents continue running instead of being terminated as well.

Related

• Discussion about subagent concurrency limits (previously observed 3 subagents starting, with 2 running before the last one started)