fix(model-requirements): use supported variant for gemini-3-pro (#1463)

* fix(model-requirements): use supported variant for gemini-3-pro

* fix(delegate-task): update artistry variant to high for gemini-3-pro

- Update DEFAULT_CATEGORIES artistry variant from 'max' to 'high'
- Update related test comment
- gemini-3-pro only supports low/high thinking levels, not max
- Addresses Oracle review feedback

src/tools/delegate-task/constants.ts

@@ -196,7 +196,7 @@ export const DEFAULT_CATEGORIES: Record<string, CategoryConfig> = {
   "visual-engineering": { model: "google/gemini-3-pro" },
   ultrabrain: { model: "openai/gpt-5.2-codex", variant: "xhigh" },
   deep: { model: "openai/gpt-5.2-codex", variant: "medium" },
-  artistry: { model: "google/gemini-3-pro", variant: "max" },
+  artistry: { model: "google/gemini-3-pro", variant: "high" },
   quick: { model: "anthropic/claude-haiku-4-5" },
   "unspecified-low": { model: "anthropic/claude-sonnet-4-5" },
   "unspecified-high": { model: "anthropic/claude-opus-4-5", variant: "max" },

src/tools/delegate-task/tools.test.ts

@@ -1492,7 +1492,7 @@ describe("sisyphus-task", () => {
         abort: new AbortController().signal,
       }
       
-      // when - artistry category (gemini-3-pro with max variant)
+      // when - artistry category (gemini-3-pro with high variant)
       const result = await tool.execute(
         {
           description: "Test artistry forced background",