chore(env): lower DFlash2 --spec-draft-n-max to 3 for long-context acceptance

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.env.example

@@ -9,7 +9,7 @@ LLAMA_CACHE_RAM=0
 LLAMA_KV_CACHE_TYPE=q8_0
 
 # Blank = speculative decoding off; see docs/architecture.md#llama-server
-LLAMA_SPEC_ARGS=--spec-type draft-dflash -md /models/Qwen3.8-27B-DFlash2-Q8_0.gguf --spec-draft-n-max 7
+LLAMA_SPEC_ARGS=--spec-type draft-dflash -md /models/Qwen3.8-27B-DFlash2-Q8_0.gguf --spec-draft-n-max 3
 
 # --- SearXNG web search --- see docs/gateway.md#web-search
 # Auto-filled by update.sh — leave blank.