resolveEvalModel (lib/eval-model.ts)

Resolves evaluation model IDs based on environment variables and defaults.

// Source: https://github.com/garrytan/gstack | License: MIT | Copyright 2026 Garry Tan
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Host-neutral eval/harness model resolution (fork port wave 2, G cluster).
 *
 * Model IDs were hardcoded at six call sites across the eval helpers and the
 * distill bin, so an environment that pins a different model (CI cost
 * control, a model migration, an air-gapped proxy alias) had to patch source.
 * One resolution point, env-overridable:
 *
 *   GSTACK_EVAL_MODEL_<KIND>  (e.g. GSTACK_EVAL_MODEL_WARMUP) — per-kind
 *   GSTACK_EVAL_MODEL                                        — global
 *   explicit argument                                        — caller wins
 *   per-kind default                                         — last 

... (truncated -- full source via MCP)