v0.2.1

Added

• [agent] prompt_delivery = "argv" | "stdin" (default argv). stdin pipes the prompt to the agent's stdin instead of placing it in argv, closing a pkill -f <token> self-kill footgun (a background worker matching on a token from the prompt could match the agent's own argv). The claude preset now defaults to stdin; existing configs are unaffected.
• agent_exit gains exit_cause (clean / error / signal:<NAME> / timeout) so monitors can distinguish a clean exit from a signal-kill without a heuristic.

Fixed

• A signal-killed round is no longer misclassified as agent_network_blip when its log happens to contain a network-error string; signal deaths are terminations, not network blips.

See docs/migrations/0.2.1.md.