stacks(char-rp): compose-ify the two NVFP4 RP seats (MeroMero + Dark-Scarlett)

Replaces the ad-hoc docker-run seats with proper compose stacks on ana-ml2, mirrored here:
- meromero-charrp: G4-MeroMero-v2-31B NVFP4A16, char-rp prose (non-thinking, multimodal,
  vision-enabled), GPU0, 256K @ ~2x. util 0.52 (leaves ~4.6GB GPU0 headroom).
- darkscarlett-charrp-reasoning: Dark-Scarlett-v1.0-27B NVFP4A16 (Qwen wrapper recipe),
  char-rp-reasoning thinking seat, GPU1, 256K. MTP deferred (no spec-decode).
Both survive reboot now. Supersede the retired char-rp-gguf + heretic2-charrp-reasoning stacks.

stacks/darkscarlett-charrp-reasoning/compose.yaml

@@ -0,0 +1,76 @@
+# darkscarlett-charrp-reasoning — Dark-Scarlett-v1.0-27B NVFP4A16 char-rp-reasoning seat
+# (THINKING default) on ana-ml2 GPU1. Replaces the retired heretic2-charrp-reasoning seat.
+#
+# Qwen3.6 hybrid GatedDeltaNet linear-attention -> KV-cheap, serves the full native 256K.
+# Quantized with llm-compressor NVFP4A16 loaded through the Qwen3_5ForConditionalGeneration
+# WRAPPER class (an AutoModelForCausalLM save produces a flat config vLLM/SGLang both reject;
+# the wrapper keeps the config they accept). Served --language-model-only (text RP).
+# MTP was dropped by the quant loader -> deferred -> NO --speculative-config.
+#
+# Co-located on GPU1 with the utility model cluster (rerankers/embed/reward/selene/coder/lfm).
+# Tunables in .env.
+
+name: darkscarlett-charrp-reasoning
+
+services:
+  vllm-darkscarlett-rp:
+    image: ${DS_IMAGE:-vllm/vllm-openai:latest}
+    container_name: ${DS_CONTAINER:-vllm-darkscarlett-rp}
+    restart: unless-stopped
+    ipc: host
+    ports:
+      - "${DS_PORT:-8018}:8000"
+    volumes:
+      - /tank/aimodels:/tank/aimodels
+    environment:
+      - PYTORCH_CUDA_ALLOC_CONF=expandable_segments:True
+      - VLLM_API_KEY=${API_KEY:-}
+    command:
+      - ${DS_MODEL:-/tank/aimodels/darkscarlett-nvfp4-work/Dark-Scarlett-v1.0-27B-NVFP4A16-wrapper}
+      - --quantization
+      - compressed-tensors
+      - --language-model-only
+      - --served-model-name
+      - char-rp-reasoning
+      - --reasoning-parser
+      - qwen3
+      - --tool-call-parser
+      - qwen3_coder
+      - --enable-auto-tool-choice
+      - --max-model-len
+      - "${DS_MAX_MODEL_LEN:-262144}"
+      - --max-num-seqs
+      - "${DS_MAX_NUM_SEQS:-32}"
+      - --gpu-memory-utilization
+      - "${DS_GPU_MEM_UTIL:-0.44}"
+      - --kv-cache-dtype
+      - fp8
+      - --trust-remote-code
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              device_ids:
+                - "${DS_GPU_ID:-1}"
+              capabilities:
+                - gpu
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 600s
+    networks:
+      - tnet
+    labels:
+      - homepage.group=AI - Inference
+      - homepage.name=char-rp-reasoning (Dark-Scarlett NVFP4)
+      - homepage.icon=mdi-brain
+      - homepage.description=Dark-Scarlett-v1.0-27B NVFP4A16 thinking seat, 256K (ana-ml2 GPU1)
+      - homepage.href=http://10.250.50.54:${DS_PORT:-8018}/docs
+
+networks:
+  tnet:
+    name: traefik-net
+    external: true