news-digest/compose: default LLAMA_SWAP_MODEL to granite-4-small

The compose-side default was still pinning qwen3.5-35-a3b — broken
on launch since its GGUF stopped working months ago. Real .env on
ana-docker overrides to granite-4-small so live deploys are unaffected,
but the default was misleading for anyone forking the stack. Found
via /tend-docs.

stacks/news-digest/compose.yaml

@@ -30,7 +30,7 @@ services:
     environment:
       - TZ=${NEWS_DIGEST_TZ:-America/Los_Angeles}
       - LLAMA_SWAP_URL=${LLAMA_SWAP_URL:-http://10.250.50.54:9292}
-      - LLAMA_SWAP_MODEL=${LLAMA_SWAP_MODEL:-qwen3.5-35-a3b}
+      - LLAMA_SWAP_MODEL=${LLAMA_SWAP_MODEL:-granite-4-small}
       - LLAMA_SWAP_TIMEOUT=${LLAMA_SWAP_TIMEOUT:-180}
       - MINIFLUX_URL=${MINIFLUX_URL:-http://miniflux:8080}
       - MINIFLUX_USER=${MINIFLUX_USER:-lkraven}