v1.0.0

The stability release, in step with rasuvaeff/property-testing-core 1.0.0.
The adapter's surface is that of 0.12.0, unchanged: #[Property] with its
knobs, PropertyInterceptor, TestoTrialExecutor, VerboseListener, the
environment table and the drop-in contract with the frozen
rasuvaeff/property-testing 2.8. A project on ^0.12 upgrades by widening
the constraint to ^1.0.

• Requires rasuvaeff/property-testing-core ^1.0 (compatibility policy
  §8: a caret on the engine's current major).
• Docs: the footnotes that dated a behaviour to a core 0.x release
  (since core 0.9, under core 0.9 …) are gone from the READMEs and
  llms.txt — every 1.0 install has the current behaviour.