Self-describing answers

The returned Answers set needs no form configuration to present or process: each answer carries a snapshot of its question (label, kind, weight, panel trail) taken at collection time, plus its provenance - default, detected, edited, derived, or override (a user value pinning a derived one). $answers->toSummary() prints the provenance-badged, panel-grouped summary, $answers->toJson() the raw values, and $answers->items exposes the per-answer snapshots.