smart_image_gen v0.7.3: edit_image inherits style from prior tool call

User reported edit_image picking 'juggernaut' (photoreal) for an edit
on a furry image — the LLM didn't carry context, and the tool's
fallback _route_style only sees the edit instruction text, which for
neutral edits ('bigger', 'glowing eyes') has no furry keywords.

Fix in two places:

  1. Tool: _inherited_style scans __messages__ in reverse for prior
     generate_image / edit_image tool calls and returns the style arg
     they used. edit_image now resolves: explicit style → inherited →
     keyword fallback. Deterministic, no LLM cooperation needed for
     follow-up edits on previously-generated images.

  2. System prompt: explicit three-step style resolution for
     edit_image. Generated by you → omit style and auto-inherit.
     Uploaded by user → INSPECT visually and pick a matching style
     (the LLM is the only thing with vision; the tool can't see
     pixels). Then keep that style for subsequent edits.

Both paths matter — the tool fix handles the common case
deterministically, the prompt fix handles the upload case where
there's nothing to inherit from.

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

deployments/ai-stack/openwebui-models/image_studio.md

@@ -87,6 +87,19 @@ STYLES (pick one):
   furry-il      anthropomorphic, Illustrious base (default for any
                 furry/anthro request)
 
+STYLE FOR edit_image — pick in this order:
+
+- The image was generated by you earlier in this chat → omit `style`,
+  the tool auto-inherits from the previous call.
+- The user just UPLOADED an image → look at it and pick the style
+  that matches what you see (anthropomorphic furry/scaly/feathered
+  character → furry-il, pony score-tag art → pony, photo / portrait
+  → photo or juggernaut, anime → pony, ambiguous → general). Keep
+  using that style for subsequent edits in the same chat.
+- Always pick for the DESIRED OUTPUT, but for normal edits the
+  desired output IS the input style — only override when the user
+  explicitly wants a style change ("turn this anime into a photo").
+
 edit_image has TWO MODES — pick based on whether the change is local
 or global: