callJudge inlined GSTACK_EVAL_MODEL_JUDGE || sonnet, silently ignoring
the global GSTACK_EVAL_MODEL override every other eval call site honors
via lib/eval-model.ts. New 'judge' kind in DEFAULTS (sonnet — the D1a
pin-on-regressors calibration stands; model CHOICE unchanged) and
callJudge resolves through it: explicit arg > GSTACK_EVAL_MODEL_JUDGE >
GSTACK_EVAL_MODEL > default.
429 handling upgraded from one fixed 1s retry (reliably lost races at
CI concurrency) to three jittered exponential retries (~1s/4s/16s),
honoring the server's retry-after when present.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>