fix: load model_overrides from config and use resolveModelInternal in CLI (#739)
loadConfig() never returned model_overrides, so resolveModelInternal() could never find per-agent overrides — they were silently ignored. Additionally, cmdResolveModel duplicated model resolution logic but skipped the override check entirely. Now delegates to resolveModelInternal so both code paths behave consistently. Co-authored-by: Ethan Hurst <ethan.hurst@outlook.com.au>
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