v6.0.0

Major Changes

• fa8b087: Adopt the current majors of the first-party dependencies: standard-log
^11.5.2 -> ^13.2.0, standard-log-color ^12.0.0 -> ^13.2.0, tersify
^3.12.1 -> ^4.0.7, and iso-error ^6.0.5 -> ^7.0.0.

  Why this matters to consumers. Installing @unional/fixture@5.0.0 resolved
  five majors of type-plus and two of tersify. The old standard-log@11 line
  pulls @just-func/types@0.5.1, which still depends on type-plus@^5.0.0, so
  type-plus@5.6.0 and type-plus@6.8.1 were nested under this package in every
  consumer's tree, and tersify@3.12.1 was hoisted out of it. This release
  removes all three: type-plus and tersify each resolve to a single version
  (8.0.0-beta.10 and 4.0.7), and standard-log to 13.2.0 only.

  Breaking. Logger (standard-log), IsoError (iso-error) and
  Tersible (tersify) all appear in this package's emitted .d.ts, so a
  consumer's own copies of those packages must move with it. standard-log@13
  also drops ES5 output.

  engines.node is unchanged at >= 20; iso-error@7.0.0's major was that same
  raise, which this package had already made.

  No behaviour of @unional/fixture changes. The only source change is in a
  test: createStandardLogForTest() moved to the standard-log/testing subpath
  in standard-log@12. tersify@4 preserves the source's own quote style rather
  than normalising to double quotes, but no assertion in this package's suite
  embeds tersified function source, so no expectation moved.