snapshot: NVFP4+MTP fast-seat quant recipe + failure state (gibberish, unisolated)

Captures the full pipeline recipe (graft->quant->splice->config->serve) with every
gotcha found this session, the 3 gibberish suspects, and the diagnostic ladder
(validate native-config no-MTP coherence FIRST) for a fresh session to finish the
chase. Also stages the NVFP4 scripts + 512-row calib. Recent decisions: NEO-CODE
seat swap (R36), webhook ALLOWED_HOST_LIST fix. Lessons: validate-tracer-bullet-first,
mtp-graft-dropped-at-load, gitea-204-red-herring.

services/heretic2-nvfp4-quant/serve_nvfp4.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# Serve the NVFP4+MTP Heretic2 seat on ana-ml2 GPU0 for P00 validation.
+# vLLM compressed-tensors NVFP4 + qwen3_5_mtp spec-decode (pantheon pattern).
+# Served as char-rp-reasoning on :8018 (the GGUF seat's port; that seat is stopped).
+set -euo pipefail
+WORK=/tank/aimodels/heretic2-nvfp4-work
+docker rm -f vllm-charrp-nvfp4-test 2>/dev/null || true
+
+docker run -d --name vllm-charrp-nvfp4-test --gpus '"device=0"' --ipc host \
+  -v /tank/aimodels:/tank/aimodels -p 8018:8000 \
+  vllm/vllm-openai:v0.24.0 \
+  "$WORK/heretic2-mtp-nvfp4-prod" \
+  --quantization compressed-tensors \
+  --speculative-config '{"method":"qwen3_5_mtp","num_speculative_tokens":3}' \
+  --reasoning-parser qwen3 --tool-call-parser qwen3_coder --enable-auto-tool-choice \
+  --language-model-only \
+  --mamba-cache-dtype float32 \
+  --served-model-name char-rp-reasoning \
+  --max-model-len 40960 --max-num-seqs 256 --gpu-memory-utilization 0.45 --trust-remote-code
+echo "container started: $(docker ps --filter name=vllm-charrp-nvfp4-test --format '{{.Status}}')"