models/schema.json: thinking_switch (the server turns thinking off for
chat_template_kwargs.enable_thinking: false) and capacity.parallel
(single_session is parallel 1). The level `off` exists only with the
switch and sends enable_thinking false and no effort; a model that takes
no efforts has the one level `default`, which sends nothing. The levels a
chat offers are (off) + efforts; one level shows no control, [off, X] a
Thinking switch, more a slider. A start level and a level the model does
not offer follow one rule. quirks.json: thinking-default; acp.md: effort
values are levels. New conformance area: levels.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
