Add Claude Fable 5 model parameters (#65)

* Add Claude Fable 5 model parameters

Adds API-key and subscription parameter files for claude-fable-5.
Same surface as Opus 4.8 (adaptive thinking, effort up to max, no
sampling params) with one difference: thinking.type only accepts
adaptive — an explicit disabled value is rejected, the parameter
must be omitted to run without thinking.

* Regenerate modelparams package data for Claude Fable 5

ci: allow same-version on the first modelparams release (#63)

The first release seeds NEXT from package.json (0.0.1), so `npm version 0.0.1` errored with 'Version not changed'. Add --allow-same-version so it's a no-op when the version already matches, while later releases still bump normally.