stacks/{fish-s2,voxtral,kyutai-tts}: three new TTS deploys for irv-ml1 quality A/B

Adds the three premier 2026 TTS releases we missed during the original
fleet build-out (early April), all licensed for self-host:

* Fish Audio S2-Pro (port 8195, GPU 1 / A6000) — released 2026-03-09.
  4B dual-AR (Slow + Fast) trained on 10M+ hours / 80+ languages.
  Headline: 15,000+ paralinguistic / emotion tags via natural language
  ([laugh] [whispers] [super happy] etc.) — a step-function over
  Chatterbox Turbo's 9 fixed tags. 91.61% paralinguistic win rate on
  EmergentTTS-Eval. ~150 ms streaming TTFB, voice cloning, MIT-style
  open. ~17 GB VRAM.

* Voxtral TTS (port 8197, GPU 1 / A6000) — Mistral, released 2026-03-28.
  4B open-weight, 70 ms model latency, 9.7× realtime. 68.4% blind A/B
  win rate vs ElevenLabs Flash v2.5 in cloning. 8 languages
  (EN/FR/DE/ES/IT/PT/NL/HI). Served via vLLM-Omni (Mistral's partner
  serving stack) — published Docker image, no local build. ~16 GB VRAM.
  CC BY-NC license — personal/research use only; flagged in README.

* Kyutai TTS (port 8198, GPU 0 / 3090) — kyutai/tts-1.6b-en_fr.
  Trained on 2.5M hours from the Moshi/Mimi team. Claimed 220 ms in
  solo setup, 32 simultaneous streams under 350 ms on L40. Kyutai's
  official deploy is Rust + websockets only; using NillPointer's
  community OpenAI-compat wrapper to bridge to /v1/audio/speech so
  it slots into the same bench harness. ~4-6 GB VRAM.

Each stack: compose.yaml (build context, env, volumes, healthcheck,
homepage label), .env.example (all tunables documented), README.md
(why it exists, headline numbers, API, deploy + hardware notes).
Playbooks at playbooks/deploy-{fish-s2,voxtral,kyutai-tts}.yaml are
idempotent in the same shape as the existing deploy-vibevoice /
deploy-chatterbox playbooks.

Port allocations on irv-ml1 after this lands: 8188 ComfyUI, 8190
CosyVoice, 8191 Qwen3-TTS, 8192 IndexTTS-2, 8193 Kokoro, 8194
VibeVoice, 8195 Fish, 8196 Chatterbox, 8197 Voxtral, 8198 Kyutai,
8765 Parakeet ASR.

playbooks/deploy-kyutai-tts.yaml

@@ -0,0 +1,100 @@
+# Deploy Kyutai TTS (1.6B EN/FR streaming, 220 ms claimed latency) to
+# irv-ml1.
+#
+# Builds the image locally from NillPointer/Kyutai-TTS-Server via
+# docker buildx git URL context. ~5-8 min cold build (CUDA + torch +
+# moshi + Kyutai's Mimi codec deps). First start downloads
+# kyutai/tts-1.6b-en_fr (~3-6 GB) into the bind-mounted HF cache.
+#
+# Usage:
+#   scripts/elway irv-ml1 --playbook playbooks/deploy-kyutai-tts.yaml
+#
+# Note: Kyutai's official deploy is Rust + websockets only. This stack
+# uses the NillPointer community wrapper to bridge to OpenAI-compat
+# HTTP — adds Python overhead on the request path, so measured TTFB
+# will be higher than the bare-Rust 220 ms claim. See README.
+#
+# Idempotent — every step is creates-/when-gated; rerun is safe.
+
+vars:
+  compose_dir: /opt/docker/compose/kyutai-tts
+  voices_dir: /worktank/kyutai-tts/voices
+  cache_dir: /worktank/kyutai-tts/hf_cache
+  host_port: "8198"
+
+steps:
+  # ── host-side dirs ──────────────────────────────────────────────────
+
+  - name: Ensure /worktank/kyutai-tts root exists (one-time, sudo)
+    shell: mkdir -p /worktank/kyutai-tts
+    sudo: true
+    creates: /worktank/kyutai-tts
+
+  - name: Chown /worktank/kyutai-tts to lkraven
+    shell: chown -R lkraven:lkraven /worktank/kyutai-tts
+    sudo: true
+    when: "[ \"$(stat -c %U /worktank/kyutai-tts)\" != \"lkraven\" ]"
+
+  - name: Ensure voices dir exists
+    shell: mkdir -p {{ voices_dir }}
+    creates: "{{ voices_dir }}"
+
+  - name: Ensure HF cache dir exists
+    shell: mkdir -p {{ cache_dir }}
+    creates: "{{ cache_dir }}"
+
+  - name: Ensure compose dir exists
+    shell: mkdir -p {{ compose_dir }}
+    creates: "{{ compose_dir }}"
+
+  # ── deploy compose + env ────────────────────────────────────────────
+
+  - name: Upload compose.yaml
+    upload:
+      src: stacks/kyutai-tts/compose.yaml
+      dest: "{{ compose_dir }}/compose.yaml"
+      mode: "0644"
+
+  - name: Seed .env from template (only if absent)
+    upload:
+      src: stacks/kyutai-tts/.env.example
+      dest: "{{ compose_dir }}/.env"
+      mode: "0644"
+    when: "[ ! -f {{ compose_dir }}/.env ]"
+
+  # ── build + bring up ────────────────────────────────────────────────
+
+  - name: docker compose build (~5-8 min first time; cached after)
+    shell: |
+      set -o pipefail
+      cd {{ compose_dir }} && docker compose build 2>&1 \
+        | grep -vE '^#[0-9]+ |^ => |^=> |Collecting|Downloading|Requirement|Using cached|Installing collected|Successfully (installed|built)|━'
+
+  - name: docker compose up -d
+    shell: cd {{ compose_dir }} && docker compose up -d
+
+  - name: Wait for /v1/models to respond (allow ~10 min for first download + warmup)
+    shell: |
+      for i in $(seq 1 120); do
+        curl -sf -o /dev/null --max-time 3 http://localhost:{{ host_port }}/v1/models && exit 0
+        sleep 5
+      done
+      exit 1
+    changed_when: "false"
+
+verify:
+  - name: /v1/models returns valid JSON
+    shell: |
+      curl -sf http://localhost:{{ host_port }}/v1/models \
+        | python3 -c "import json,sys; json.load(sys.stdin)"
+    changed_when: "false"
+
+  - name: /v1/audio/voices returns valid JSON
+    shell: |
+      curl -sf http://localhost:{{ host_port }}/v1/audio/voices \
+        | python3 -c "import json,sys; json.load(sys.stdin)"
+    changed_when: "false"
+
+  - name: Container is running
+    shell: docker inspect kyutai-tts --format '{{.State.Status}}' | grep -q running
+    changed_when: "false"