Eliminate first-inpaint timeout: preseed SAM/GroundingDINO + 600s default

Two changes to address the timeout-and-retry loop the user hit on the
first edit_image call:

  1. comfyui-init-models.sh now fetches the three weights inpaint
     needs into /models/sams and /models/grounding-dino:
       - sam_hq_vit_h.pth                (~2.5 GB)
       - groundingdino_swint_ogc.pth     (~700 MB)
       - GroundingDINO_SwinT_OGC.cfg.py  (~1 KB)
     Without preseeding these auto-download on first inpaint, which
     takes minutes and times out the tool call. The mkdir line gets
     the new subdirs added too.

  2. Tool TIMEOUT_SECONDS valve default bumped 240s → 600s as
     defense-in-depth — even with weights preseeded, BERT-base
     auto-downloads via transformers on first GroundingDINO load
     (~30s) and a slow KSampler on a contended GPU can push past
     4 minutes occasionally. Steady-state runs still finish in under
     a minute; the valve only matters for first-call latency.

After comfyui-model-init re-runs (`docker compose up -d
comfyui-model-init`), first inpaint should be near-instant.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

deployments/ai-stack/comfyui-init-models.sh

@@ -14,7 +14,8 @@ set -e
 apk add --no-cache curl >/dev/null
 
 mkdir -p /models/checkpoints /models/vae /models/loras /models/controlnet \
-         /models/clip /models/clip_vision /models/upscale_models /models/embeddings
+         /models/clip /models/clip_vision /models/upscale_models /models/embeddings \
+         /models/sams /models/grounding-dino
 
 fetch() {
     dest="$1"; name="$2"; url="$3"
@@ -65,4 +66,19 @@ fetch() {
 # fetch upscale_models 4x-UltraSharp.pth \
 #     https://huggingface.co/lokCX/4x-Ultrasharp/resolve/main/4x-UltraSharp.pth
 
+# ─── Inpainting models (SAM-HQ + GroundingDINO) ─────────────────────────────
+# Required by the smart_image_gen Tool's edit_image with mask_text. ComfyUI
+# would auto-download these on first use, but that takes minutes and tends
+# to time out in-flight tool calls — preseeding here makes the first inpaint
+# instant.
+
+fetch sams sam_hq_vit_h.pth \
+    https://huggingface.co/lkeab/hq-sam/resolve/main/sam_hq_vit_h.pth
+
+fetch grounding-dino groundingdino_swint_ogc.pth \
+    https://huggingface.co/ShilongLiu/GroundingDINO/resolve/main/groundingdino_swint_ogc.pth
+
+fetch grounding-dino GroundingDINO_SwinT_OGC.cfg.py \
+    https://huggingface.co/ShilongLiu/GroundingDINO/resolve/main/GroundingDINO_SwinT_OGC.cfg.py
+
 echo "Done."

deployments/ai-stack/openwebui-tools/smart_image_gen.py

@@ -1,7 +1,7 @@
 """
 title: Smart Image Generator & Editor (ComfyUI)
 author: ai-stack
-version: 0.7.3
+version: 0.7.4
 description: Generate or edit images via ComfyUI with automatic SDXL
     checkpoint routing. Two methods — generate_image (txt2img) and
     edit_image (img2img on the user's most recently attached image). The
@@ -684,8 +684,15 @@ class Tools:
             description="ComfyUI server URL reachable from the open-webui container.",
         )
         TIMEOUT_SECONDS: int = Field(
-            default=240,
-            description="Maximum wait for a single generation to complete.",
+            default=600,
+            description=(
+                "Maximum wait for a single generation to complete. "
+                "Default 10 minutes — long enough to absorb a first-time "
+                "inpaint where SAM-HQ + GroundingDINO + BERT auto-download "
+                "(~3 GB). Steady-state runs finish in well under a minute; "
+                "if your KSampler routinely takes longer than that, lower "
+                "the per-style steps in STYLES."
+            ),
         )
 
     def __init__(self):