v0.3.1

Fixed

• Evidence.proves was emitted as ["","",""] on every result. omitempty on a
  fixed-size array is, and always was, a no-op: encoding/json applies it to nil
  slices and maps, zero numbers, empty strings, false and nil pointers, never to an
  array. A zero [3]string therefore serialised as three blanks in the JSON output,
  in sealed evidence bundles, and in anything built on top of them — so a consumer
  could not tell "no proof was recorded" from "three proofs were recorded and all are
  blank". The two mean very different things for a model whose contract is that a
  status is backed by what was actually observed. Evidence now marshals through its
  own method, which omits the field when nothing was recorded. The type is
  unchanged: the three positions ARE the meaning (report.provesDimensions indexes
  them by name), a scanner filling only the first stays distinguishable from one
  filling none, and no caller writing Proves: [3]string{…} breaks.