v0.1.2

• Recorded why eleven FileWrapper methods are excluded from mutation, next to
  the exclusion itself. The text is the one written when the list was
  introduced and dropped later with the gate's rationale block; a silent
  exclusion cannot be told apart from one made to get the gate green.

• AGENTS.md now carries the perf ritual: re-measure perf/ on the commit the
  current figures came from before comparing a release candidate, because
  nothing in CI defends those numbers.

• The release workflow waits for the matrix build instead of judging it
  mid-flight. A tag pushed right after the merge arrived while master's own
  build was still running, and the guard read a null conclusion as a failed
  one — so v0.1.1 published to Packagist but its GitHub Release had to be
  created by re-running the workflow. No effect on the package itself.

• Arg::allOf() and Arg::anyOf(). The matcher algebra had negation and
  nothing to negate against: not() composed, but two conditions on one
  argument needed a hand-written satisfies() closure, which then had to carry
  its own description or render as satisfies(…) in every failure message. An
  operand is a matcher or a literal, the same pair not() takes, so
  anyOf('draft', 'review') reads as a set and
  allOf(instanceOf(Book::class), which('getTitle', 'Dune')) reads as a
  conjunction — both describing themselves in full when an expectation fails.
  A combinator with no operands, and one holding a tail matcher, are refused
  with the reason rather than silently matching everything.