feat(gallery): add Jumbo Fusion 27B variants

Add pinned Q4_K_M and Q8_0 builds with linked variants and install docs.
Regenerate the gallery from the model library and fix its stale header.

Assisted-by: Codex:gpt-6

docs/content/features/model-gallery.md

@@ -44,6 +44,24 @@ Both views store the view, search, filter, and selection in the URL. Installing
 from Explore does not move you away from the catalog; the entry updates in place
 when the operation finishes.
 
+### Qwen3.8 Jumbo Fusion 27B
+
+The gallery includes DavidAU's Qwen3.8 Jumbo Fusion Q4_K_M and Q8_0 GGUF builds
+for text chat through llama.cpp. Both use the embedded chat template and a
+32,768-token default context. These entries do not include a vision projector
+or enable MTP decoding.
+
+Install with automatic variant selection:
+
+```bash
+local-ai models install qwen3.8-27b-jumbo-fusion-q4
+```
+
+Use `--variant qwen3.8-27b-jumbo-fusion-q4` or
+`--variant qwen3.8-27b-jumbo-fusion-q8` to select a specific build.
+See the [publisher's model card](https://huggingface.co/DavidAU/Qwen3.8-27B-Jumbo-Fusion-IQ-747-900-Turbo-Brilliance-50X-Reasoning-Instruct-NEO-MAX-MTP-GGUF)
+for its custom reasoning and instruction modes.
+
 ### MiniCPM-V 4.7 1B
 
 [MiniCPM-V 4.7 1B](https://huggingface.co/openbmb/MiniCPM-V-4.7-1B)