v0.7.3

Fixed

• A stage that pays for LLM calls and then fails is now billed for that
  spend: stage_fail accumulates cost_usd like stage_complete, and
  DistillError carries the distiller's grounding-retry cost across the
  raise. Previously a failed distill — the one run you most want a spend
  figure for — reported $0.00 (#209, closes #103).

Changed

• Docs: howto.jsonld added to the README's generated-outputs list and
  llm_backend to its config example (#119, thanks @BenjaminAyivoh1);
  the architecture diagram, module map, and the debug-run skill now show
  the real verify → tutorial → render stage order (#211, thanks
  @professor314).