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LLM_MODEL_TIER_C, LLM_MODEL_TIER_B e OPENROUTER_BASE_URL ora override-abili via env. Default invariati (back-compat). LLMClient accetta i tre valori come kwargs opzionali; run_phase1 li propaga da Settings. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>