Prompt nodes now support an executor kind: model (provider/model override),
agent (adopts a named agent's model + custom instructions), skill (prompt
becomes a skill invocation), and cli (named project script with the prompt in
FUSION_NODE_PROMPT — raw commands still never accepted). Per-node maxRetries
overrides the executor-wide default (capped at 10). Await-input nodes pause the
task with status 'awaiting-user-input' and the question as pausedReason; on
unpause the newest steering comment is consumed as the answer and exposed in
graph context.