Stop Running Agents

Agents can now be stopped mid-run from anywhere in the product, instead of running to completion once started. Interloom waits for the current tool call or turn to finish before stopping, so in-flight cost and output aren’t lost, and the last tool call’s output is recorded and available downstream.

The stopped stage is marked as blocked. Concurrent invocations can be stopped individually; stopping a parent agent doesn’t cascade to its subtasks.