- strip interior NUL bytes from hook env values in fire_resolved so
agent-authored text (e.g. escalation questions) cannot suppress a hook
via a failed spawn; raise the spawn-failure log to warn!
- make Supervisor::has_active_tasks recurse into child supervisors,
mirroring cancel_recursive, so a prompt ctrl-c that cancels only a
grandchild still latches as an interruption
- document the signal-first vs error-first classification asymmetry at
top_level_agent_finished / SpawnResultHooks::fire and the deliberate
REPL teardown cancel; pin ctrlc-with-no-error => agent.interrupted
- probe Scenario J: pty-driven ctrl-c during a live headless --agent run
fires exactly one agent.interrupted with no COYOTE_AGENT_ERROR