corpusFailure method
The corpus failure entry for touchpoint's method, when the
corpus itself scripts the failure (fixture-table-level faults,
distinct from the storm schedule).
Implementation
Map<String, dynamic>? corpusFailure(String touchpoint, String method) {
final entry = corpus[touchpoint]?[method];
if (entry == null) return null;
final failure = entry['failure'];
if (failure is Map<String, dynamic>) return failure;
if (failure is Map) return Map<String, dynamic>.from(failure);
return null;
}