feat: remove llama-server-fast (Qwen3-4B classifier model)

Drops the second always-resident llama.cpp instance, its downloader,
and the omniroute depends_on entry. Also strips the now-dead
LLAMA_FAST_* block from .env.example and the stale VRAM-budget comment
in scripts/switch-model.sh that assumed this service was always up.

Note: this was qwen-code's Auto Mode Stage 1 classifier (fastModel) —
see docs/research/fast-model-choice.md and issue #44. Auto Mode will
lose that classifier until/unless it's reconfigured to route
elsewhere or fall back to prompt-only classification.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DjhxWirQepKFEQj1huXNJR

docker-compose.yml

@@ -15,8 +15,7 @@ services:
     ipc: host
     # Caps this process's HIP hardware-queue allocation — works around
     # ROCm/ROCm#5706 (GPU pinned at 100%/boost-clock whenever two
-    # concurrent HIP contexts touch this card, confirmed on real hardware
-    # against llama-server-fast below). See the research doc above.
+    # concurrent HIP contexts touch this card). See the research doc above.
     environment:
       - GPU_MAX_HW_QUEUES=1
     volumes:
@@ -47,49 +46,6 @@ services:
       - "lazytainer.group.llamaserver.inactiveTimeout=${LAZYTAINER_INACTIVE_TIMEOUT:-900}"
       - "lazytainer.group.llamaserver.minPacketThreshold=2"
 
-  llama-server-fast:
-    image: ghcr.io/ggml-org/llama.cpp:server-rocm
-    container_name: llama-server-fast
-    devices:
-      - /dev/kfd
-      - /dev/dri
-    group_add:
-      - "${HOST_VIDEO_GID:?run scripts/update.sh first to resolve this}"
-      - "${HOST_RENDER_GID:?run scripts/update.sh first to resolve this}"
-    security_opt:
-      - seccomp=unconfined
-    ipc: host
-    # See llama-server's identical setting above — same fix, same bug.
-    environment:
-      - GPU_MAX_HW_QUEUES=1
-    volumes:
-      - models:/models
-    command: >
-      -m /models/${LLAMA_FAST_MODEL_FILE:-Qwen3-4B-Instruct-2507-UD-Q8_K_XL.gguf}
-      --host 0.0.0.0
-      --port 8080
-      --n-gpu-layers ${LLAMA_FAST_GPU_LAYERS:-999}
-      --ctx-size ${LLAMA_FAST_CTX_SIZE:-8192}
-      --parallel ${LLAMA_FAST_PARALLEL:-1}
-      --flash-attn on
-      --cache-type-k q8_0
-      --cache-type-v q8_0
-      --reasoning off
-      --jinja
-    # Second, always-resident llama.cpp instance — small non-thinking model
-    # used as qwen-code's Auto Mode classifier fastModel, alongside the main
-    # 27B instance above. See docs/research/fast-model-choice.md and #44.
-    # Same ai-stack-only pattern as llama-server: no published host port.
-    expose:
-      - "8080"
-    restart: unless-stopped
-    networks: [ai-stack]
-    labels:
-      - "lazytainer.group.llamaserverfast.sleepMethod=stop"
-      - "lazytainer.group.llamaserverfast.ports=8080"
-      - "lazytainer.group.llamaserverfast.inactiveTimeout=${LAZYTAINER_INACTIVE_TIMEOUT:-900}"
-      - "lazytainer.group.llamaserverfast.minPacketThreshold=2"
-
   # ponytail: one-off downloader, not a standing service — run via
   # `docker compose --profile tools run --rm downloader`. Folded into
   # scripts/update.sh, which runs this every time; the `test -f` guard is
@@ -111,26 +67,9 @@ services:
         curl -L --fail --create-dirs -o /models/${LLAMA_MODEL_FILE:-Qwen3.8-27B-UD-Q4_K_XL.gguf}
         https://huggingface.co/unsloth/Qwen3.8-27B-GGUF/resolve/main/${LLAMA_MODEL_FILE:-Qwen3.8-27B-UD-Q4_K_XL.gguf}
 
-  # Same test -f guard pattern as downloader above — fetches the second,
-  # smaller model for llama-server-fast. See issue #44.
-  downloader-fast:
-    image: curlimages/curl:latest
-    profiles: ["tools"]
-    user: root
-    volumes:
-      - models:/models
-    entrypoint: ["sh", "-c"]
-    command:
-      - >
-        test -f /models/${LLAMA_FAST_MODEL_FILE:-Qwen3-4B-Instruct-2507-UD-Q8_K_XL.gguf} &&
-        echo "already downloaded, skipping" ||
-        curl -L --fail --create-dirs -o /models/${LLAMA_FAST_MODEL_FILE:-Qwen3-4B-Instruct-2507-UD-Q8_K_XL.gguf}
-        https://huggingface.co/unsloth/Qwen3-4B-Instruct-2507-GGUF/resolve/main/${LLAMA_FAST_MODEL_FILE:-Qwen3-4B-Instruct-2507-UD-Q8_K_XL.gguf}
-
   # Fetches the three Qwen-Image FP8 files ComfyUI needs (diffusion model,
-  # text encoder, VAE) — same test -f guard pattern as downloader/
-  # downloader-fast above. See docs/research/image-generation-model-choice.md
-  # and issue #42.
+  # text encoder, VAE) — same test -f guard pattern as downloader above.
+  # See docs/research/image-generation-model-choice.md and issue #42.
   #
   # ponytail: target paths assume ComfyUI's standard models/ layout under
   # BASE_STORAGE_PATH (/storage) — same "not independently confirmed against
@@ -184,7 +123,7 @@ services:
       # This image also wants GID env vars directly (its own README asks
       # for both these and group_add above) — same HOST_VIDEO_GID/
       # HOST_RENDER_GID resolved by scripts/update.sh, shared with
-      # llama-server/llama-server-fast now instead of comfyui-only vars.
+      # llama-server now instead of comfyui-only vars.
       - PUID=${COMFYUI_PUID}
       - PGID=${COMFYUI_PGID}
       - VIDEO_GID=${HOST_VIDEO_GID}
@@ -220,8 +159,6 @@ services:
     depends_on:
       llama-server:
         condition: service_started
-      llama-server-fast:
-        condition: service_started
     volumes:
       - omniroute-data:/app/data
     env_file: .env