The leader adds the picture and 3D presets a node fits, unless told not to

A customer's portal had no Images or 3D pages: nobody had written a
definition for either, on a cluster whose V100 runs both. The leading
control plane now adds flux-schnell and triposr, on demand, once a node
has a card that fits one, the cluster installs ComfyUI, and the catalog
makes nothing of that kind. presets.auto (a live setting, on by default)
turns it off; a preset somebody removes is recorded as declined and not
added back until added again by hand. Each addition is in the audit log.

GET /api/v1/presets says how each preset stands, the ComfyUI the cluster
installs, and why one is not added; POST /api/v1/presets/{name} adds one
(setting engines.comfyui where there is none); PUT /api/v1/presets/auto
switches it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/reference.md

@@ -244,6 +244,7 @@ rather than repeated.
 | `match_ratio` | `float64` | [Prefix](#prefix) |
 | `balance_abs` | `float64` | [Prefix](#prefix) |
 | `balance_rel` | `float64` | [Prefix](#prefix) |
+| `auto` | `bool` | [PresetSettings](#presetsettings) |
 | `source` | `string` | [PreviousOrigin](#previousorigin) |
 | `revision` | `string` | [PreviousOrigin](#previousorigin) |
 | `files` | `[]OriginFile` | [PreviousOrigin](#previousorigin) |
@@ -344,6 +345,7 @@ rather than repeated.
 | `mail` | `mail.Config` | [Server](#server) |
 | `serving` | `ServingSettings` | [Server](#server) |
 | `firewall` | `FirewallSettings` | [Server](#server) |
+| `presets` | `PresetSettings` | [Server](#server) |
 | `agents` | `AgentSettings` | [Server](#server) |
 | `firewall_networks` | `[]string` | [Server](#server) |
 | `backup_recipients` | `[]string` | [Server](#server) |
@@ -2158,6 +2160,20 @@ before affinity is abandoned.
 
 `float64`
 
+## PresetSettings
+
+### `auto`
+
+`bool`
+
+Auto has the leading control plane add a picture model (flux-schnell)
+and a 3D model (triposr) by itself, on demand, once a node has a card
+that fits one and the catalog has no model that makes the same kind of
+thing — so a new cluster's portal has its pictures and 3D pages
+without anybody writing a definition. Only where the cluster already
+installs ComfyUI (engines.comfyui). A preset somebody removed is not
+added again by itself. In force on the leader within a minute.
+
 ## PreviousOrigin
 
 ### `source`
@@ -2960,6 +2976,14 @@ Firewall turns llmgw's firewall on every machine on or off.
 
 Takes a [FirewallSettings](#firewallsettings) block.
 
+### `presets`
+
+`PresetSettings`
+
+Presets is how the models that come with llmgw reach the catalog.
+
+Takes a [PresetSettings](#presetsettings) block.
+
 ### `agents`
 
 `AgentSettings`