Document resolve_model_ids: "omit" (set automatically by installer for non-Claude runtimes), explain model_overrides with non-Claude model IDs, and add a decision table for choosing between inherit, omit, and overrides. Updates CONFIGURATION.md, USER-GUIDE.md, and the model-profiles.md skill reference. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>