Address review-driven fixes across actor schema, preflight guardrails, docs/examples,
and Behave/Robot coverage: unify preflight warning behavior with shared role-warning logic,
resolve actor-name to config payloads in production preflight flow, harden response_format
validation/coercion edge cases, extract duplicated helper logic, and expand negative-path
test coverage. Also fix cross-scenario patcher leakage in step modules to eliminate
full-run-only coverage failures.