feat(irv-ml1): pin comfyui to A6000 + torch-pin; parakeet -> 3090 (VRAM consolidation)

Operator consolidation (2026-06-18): give ComfyUI the full 48 GB A6000 and move the
audio/TTS zoo to the 3090.

- comfyui: NVIDIA_VISIBLE_DEVICES all -> 1 (A6000 only), + DISABLE_UPGRADES=true to
  pin torch at 2.12.1+cu129 so the mmartial boot script stops auto-upgrading it and
  the compiled SageAttention kernels stay matched (comfy-dev torch-pin, approved).
- parakeet: NVIDIA_VISIBLE_DEVICES all -> 0 (3090).

Other GPU reassignments are deployment-side (not repo compose): chatterbox-fast via
its .env CBF_GPU_DEVICES=0; vibevoice device_ids ["1"]->["0"] (deployed from
/worktank/vibevoice/build); yt-voice-clipper worker via its override. dia2-2b,
ace-step, csm-expressiva downed (stale/unused).

Result: A6000 = ComfyUI alone (48.3 GB free); 3090 = chatterbox + parakeet + the
on-demand audio (vibevoice/ytvc/kokoro). SageAttention rebuilt against the pinned
torch; OOM cmdline (COMFY_CMDLINE_EXTRA) preserved; /object_info still lists the 9
acceleration nodes.

stacks/comfyui/compose.yaml

@@ -1,8 +1,9 @@
 # ComfyUI — node-based Stable Diffusion / Flux inference UI.
 #
-# Runs on irv-ml1 (dual GPU: RTX 3090 + RTX A6000). Both GPUs are
-# exposed via NVIDIA_VISIBLE_DEVICES=all so GPU selection happens
-# per-workflow inside ComfyUI.
+# Runs on irv-ml1 (dual GPU: RTX 3090 + RTX A6000). PINNED to the A6000
+# (device 1) via NVIDIA_VISIBLE_DEVICES=1 — the 3090 hosts the audio/TTS
+# zoo (chatterbox, parakeet, vibevoice, ytvc, kokoro) so ComfyUI gets the
+# full 48 GB A6000 to itself (operator consolidation 2026-06-18).
 #
 # All user state — models, workflows, custom_nodes, input, output —
 # lives under a single BASE_DIRECTORY tree on /worktank (462 GB
@@ -30,7 +31,11 @@ services:
     ports:
       - "${COMFYUI_BIND:-0.0.0.0}:${COMFYUI_PORT}:8188"
     environment:
-      - NVIDIA_VISIBLE_DEVICES=all
+      - NVIDIA_VISIBLE_DEVICES=1
+      # Pin torch at the current 2.12.1+cu129 so the boot script stops
+      # auto-upgrading it — compiled SageAttention kernels must not drift
+      # (comfy-dev torch-pin, operator-approved 2026-06-18).
+      - DISABLE_UPGRADES=true
       - WANTED_UID=${COMFYUI_UID}
       - WANTED_GID=${COMFYUI_GID}
       - BASE_DIRECTORY=/basedir

stacks/parakeet/compose.yaml

@@ -29,7 +29,7 @@ services:
     ports:
       - "${PARAKEET_BIND:-0.0.0.0}:${PARAKEET_PORT}:8000"
     environment:
-      - NVIDIA_VISIBLE_DEVICES=all
+      - NVIDIA_VISIBLE_DEVICES=0
       - MODEL_DIR=/models
       - MODEL_URL=${PARAKEET_MODEL_URL}
       - PROVIDER=${PARAKEET_PROVIDER:-cuda}