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Spec the error presenter's middleware and version branches (#3000)

`ErrorFormatter::Base#present` had two branches no spec reached:

- A route's failure presenter is only looked up when the endpoint has a
  request, i.e. for an error the endpoint raised itself. An error
  thrown by middleware before the endpoint ran keeps the shape that
  middleware gave it. A spec now pins that, and the comment on the
  check says so: it read as if the lookup could not work there, which
  it can -- the error middleware sets the status first.
- The presenter is handed `version:` on a versioned request.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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