catalog(canonical): remove chatterbox dead levers + add csm-expressiva

The asset-engine catalog source of truth. Removes the chatterbox
exaggeration/cfg_weight sliders (proven Turbo no-ops) — reconciling the
canonical with the fix previously applied only to asset-engine's vendored
copy — and adds the csm-expressiva whisper TTS entry (irv-ml1:8198).

docs/asset-engine/services.yaml

@@ -203,8 +203,8 @@ services:
     description: >
       Resemble AI's low-latency English TTS (Chatterbox-Turbo, 350M, ~75ms TTFB,
       6× realtime). 28 built-in predefined voices + zero-shot cloning from a
-      5–30s reference. Inline paralinguistic tags, plus Resemble's signature
+      5–30s reference. Inline paralinguistic tags. (Resemble's exaggeration /
-      exaggeration / cfg_weight emotion + pacing control.
+      cfg_weight emotion knobs are no-ops on the Turbo checkpoint — omitted.)
     category: tts
     version: 2
     status: ready
@@ -225,7 +225,7 @@ services:
         label: Text & voice
       - id: sampling
         label: Expression & sampling
-        hint: Resemble's neutral defaults (exaggeration 0.5 / cfg_weight 0.5). Raise exaggeration or lower cfg_weight for drama.
+        hint: Turbo honors temperature / seed / speed_factor. (exaggeration / cfg_weight are Turbo no-ops — removed.)
       - id: advanced
         label: Advanced
     fields:
@@ -276,32 +276,12 @@ services:
           Required when voice_mode=clone. 5–30s clean WAV (16 kHz+ mono) under
           /worktank/chatterbox/reference_audio/; upload via the server's
           /upload_reference. Match the clip's language to `language` to avoid
-          accent transfer (or set cfg_weight=0).
+          accent transfer.
-      - name: exaggeration
+      # exaggeration / cfg_weight intentionally removed: Chatterbox-Turbo IGNORES
-        type: slider
+      # both. Proven 2026-06-04 — same text/voice/seed across cfg 0.0/0.5/0.9 gave
-        section: sampling
+      # byte-identical audio, and the model logs "CFG, min_p and exaggeration are
-        min: 0.25
+      # not supported by Turbo version and will be ignored." They were dead UI
-        max: 2.0
+      # sliders. They'd only do something on a non-turbo Chatterbox checkpoint.
-        step: 0.05
-        default: 0.5
-        description: >
-          Emotional intensity. Resemble's docs: 0.5 "works well for most prompts
-          across all languages"; ~0.7+ for dramatic delivery (which also speeds
-          speech up). NOTE: the devnen server *ships* 1.3 (tuned for its
-          theatrical demo presets) — 0.5 is the general-use value and the catalog
-          default; the shipped 1.3 is the likely cause of over-acted/unstable output.
-      - name: cfg_weight
-        type: slider
-        section: sampling
-        min: 0.0
-        max: 1.0
-        step: 0.05
-        default: 0.5
-        description: >
-          Pacing / prompt adherence (Resemble default 0.5). Lower to ~0.3 to
-          slow delivery, for fast/intense reference speakers, or alongside a
-          raised exaggeration for drama; 0 effectively disables guidance (useful
-          to reduce reference-accent transfer).
       - name: temperature
         type: slider
         section: sampling
@@ -368,16 +348,16 @@ services:
       warm_per_unit: "~75ms TTFB, 6× realtime"
     license: MIT
     notes: |
-      Routes to the devnen wrapper's richer /tts (full control surface:
+      Routes to the devnen wrapper's /tts (control surface: temperature /
-      exaggeration / cfg_weight / temperature / speed_factor / seed / voice_mode)
+      speed_factor / seed / voice_mode) rather than the thin OpenAI
-      instead of the thin OpenAI /v1/audio/speech, which exposes NONE of the
+      /v1/audio/speech. exaggeration / cfg_weight were DROPPED 2026-06-04 — the
-      emotion knobs — that omission was why prior output was poor. Same wrapper
+      Turbo checkpoint ignores them (proven byte-identical across cfg values; the
-      author as the `dia` stack; identical predefined/clone voice model.
+      model warns they're "not supported by Turbo version and will be ignored"),
-      Defaults sourced from Resemble's README (exaggeration + cfg_weight = 0.5)
+      so they were dead UI sliders. Same wrapper author as the `dia` stack;
-      and the server's generation_defaults (temperature 0.8, speed 1.0, seed 0),
+      identical predefined/clone voice model. Defaults from the server's
-      read live 2026-06-01; the server's shipped exaggeration 1.3 is demo-tuned
+      generation_defaults (temperature 0.8, speed 1.0, seed 0), read live
-      and deliberately NOT adopted. Python 3.10 only (wrapper hardcoding);
+      2026-06-01. Python 3.10 only (wrapper hardcoding); multilingual (23-language)
-      multilingual (23-language) variant available via the stack .env.
+      variant available via the stack .env.
 
   - id: chatterbox-fast
     name: Chatterbox Fast (streaming)
@@ -673,6 +653,91 @@ services:
     notes: |
       Voice cloning shape differs from CosyVoice: profile-based, not voice-id-based.
 
+  - id: csm-expressiva
+    name: CSM Expressiva (whisper)
+    description: >
+      Experimental LoRA fine-tune of Sesame's CSM-1B (Conversational Speech Model)
+      on Expresso's whispering voice — WHISPER-style speech only, trained speaker
+      = 4. Custom thin server (no upstream CSM server image exists). Autoregressive,
+      so ~RTF 1.8 on the A6000 — good for offline/clip generation, not live
+      streaming. License cc-by-nc-4.0 (non-commercial). No output watermark.
+    category: tts
+    version: 1
+    status: experimental
+    host: irv-ml1
+    lifecycle:
+      stack: csm-expressiva
+      vram_gb: 4
+      gpu_device_id: 1
+    endpoint: http://10.100.79.3:8198/tts
+    method: POST
+    content_type: application/json
+    model:
+      id: senstella/csm-expressiva-1b
+      revision: null
+      image: local/csm-expressiva:v1
+    section_groups:
+      - id: basic
+        label: Text
+      - id: sampling
+        label: Sampling
+    fields:
+      - name: text
+        type: textarea
+        label: Text
+        section: basic
+        required: true
+        max_length: 2000
+        description: >
+          Text to synthesize as a whisper. CSM is conversational — short
+          utterances work best. No inline paralinguistic tag support.
+      - name: speaker
+        type: number
+        section: basic
+        required: false
+        default: 4
+        description: >
+          Speaker id. The fine-tune only trained speaker 4 (Expresso whisper);
+          leave at 4 — other ids fall back to off-distribution base-CSM behavior.
+      - name: max_audio_length_ms
+        type: number
+        section: sampling
+        required: false
+        default: 20000
+        description: Hard cap on generated audio length (ms); generation stops early on EOS.
+      - name: temperature
+        type: slider
+        section: sampling
+        min: 0.05
+        max: 1.5
+        step: 0.05
+        default: 0.8
+        description: Sampling temperature. Repo (csm-mlx) example default 0.8.
+      - name: topk
+        type: number
+        section: sampling
+        required: false
+        default: 50
+        description: Top-k sampling cutoff. Repo example default 50.
+    response:
+      type: audio
+      mime: audio/wav
+    reproducibility:
+      seedable: false
+      deterministic: false
+      notes: >
+        No seed field exposed; temperature-sampled, so takes vary run to run.
+    estimated_latency:
+      cold_start_s: 30
+      warm_per_unit: "~RTF 1.8 (≈9s compute per ≈5s of audio on the A6000)"
+    license: cc-by-nc-4.0
+    notes: |
+      Whisper-only experimental fine-tune. Custom thin FastAPI wrapper around the
+      vendored Sesame csm generator (watermark + silentcipher stripped; ungated
+      Llama-3.2 tokenizer mirror). Runs eager — CSM has no torch.compile hot path,
+      so the compiled image gained nothing. NOT behind the LiteLLM gateway (custom
+      /tts schema, not OpenAI /v1/audio/speech).
+
   - id: cosyvoice
     name: CosyVoice 3 (Multilingual)
     description: >
@@ -2132,6 +2197,11 @@ reproducibility_audit:
     model_deterministic: false
     image_tag_mutable: true
     notes: "/tts exposes seed (0=random) — one-shot byte-exact for fixed seed+params (verified 2026-06-02); STREAMING non-reproducible (timing-dependent chunk boundaries), auditions ephemeral. PerTh watermark unconditional. image local/chatterbox-fast:v1 is tag-pinned + mutable — pin a digest for true repro."
+  - service: csm-expressiva
+    seedable: false
+    model_deterministic: false
+    image_tag_mutable: true
+    notes: "No seed field exposed; temperature-sampled, takes vary run to run. No watermark (stripped). image local/csm-expressiva:v1 is tag-pinned + mutable — pin a digest for true repro. Runs eager (CSM has no torch.compile hot path)."
   - service: index-tts
     seedable: false
     model_deterministic: true