Move all speculative-decoding flags into LLAMA_SPEC_ARGS (blank = off) and the KV cache quant into LLAMA_KV_CACHE_TYPE, so token-corruption A/B tests are a single .env edit instead of a compose edit. Replaces LLAMA_DRAFT_MODEL_FILE and LLAMA_SPEC_N_MAX. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>