refactor(ultrawork): remove thinking config injection from model override

Delegate thinking config control to the provider layer rather than
injecting it manually in ultrawork model override.

🤖 Generated with assistance of [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

assets/oh-my-opencode.schema.json

@@ -960,6 +960,9 @@
                 }
               },
               "additionalProperties": false
+            },
+            "allow_non_gpt_model": {
+              "type": "boolean"
             }
           },
           "additionalProperties": false
@@ -3248,6 +3251,11 @@
           "prompt_append": {
             "type": "string"
           },
+          "max_prompt_tokens": {
+            "type": "integer",
+            "exclusiveMinimum": 0,
+            "maximum": 9007199254740991
+          },
           "is_unstable_agent": {
             "type": "boolean"
           },

src/plugin/ultrawork-db-model-override.ts

@@ -21,11 +21,10 @@ function tryUpdateMessageModel(
   )
   const result = stmt.run(targetModel.providerID, targetModel.modelID, messageId)
   if (result.changes === 0) return false
-
   if (variant) {
     db.prepare(
-      `UPDATE message SET data = json_set(data, '$.variant', ?, '$.thinking', ?) WHERE id = ?`,
-    ).run(variant, variant, messageId)
+      `UPDATE message SET data = json_set(data, '$.variant', ?) WHERE id = ?`,
+    ).run(variant, messageId)
   }
   return true
 }

src/plugin/ultrawork-model-override.test.ts

@@ -308,10 +308,6 @@ describe("applyUltraworkModelOverrideOnMessage", () => {
     //#then
     expect(output.message.model).toEqual({ providerID: "anthropic", modelID: "claude-opus-4-6" })
     expect(output.message["variant"]).toBe("max")
-    expect(output.message["thinking"]).toEqual({
-      type: "enabled",
-      budgetTokens: 16000,
-    })
     expect(dbOverrideSpy).not.toHaveBeenCalled()
   })
 
@@ -327,10 +323,6 @@ describe("applyUltraworkModelOverrideOnMessage", () => {
     //#then
     expect(output.message.model).toBeUndefined()
     expect(output.message["variant"]).toBe("high")
-    expect(output.message["thinking"]).toEqual({
-      type: "enabled",
-      budgetTokens: 16000,
-    })
     expect(dbOverrideSpy).not.toHaveBeenCalled()
   })
 

src/plugin/ultrawork-model-override.ts

@@ -8,7 +8,6 @@ import { scheduleDeferredModelOverride } from "./ultrawork-db-model-override"
 const CODE_BLOCK = /```[\s\S]*?```/g
 const INLINE_CODE = /`[^`]+`/g
 const ULTRAWORK_PATTERN = /\b(ultrawork|ulw)\b/i
-const ULTRAWORK_THINKING_CONFIG = { type: "enabled", budgetTokens: 16000 } as const
 
 export function detectUltrawork(text: string): boolean {
   const clean = text.replace(CODE_BLOCK, "").replace(INLINE_CODE, "")
@@ -118,7 +117,6 @@ export function applyUltraworkModelOverrideOnMessage(
   if (!override.providerID || !override.modelID) {
     if (override.variant) {
       output.message["variant"] = override.variant
-      output.message["thinking"] = { ...ULTRAWORK_THINKING_CONFIG }
     }
     return
   }
@@ -135,7 +133,6 @@ export function applyUltraworkModelOverrideOnMessage(
     output.message.model = targetModel
     if (override.variant) {
       output.message["variant"] = override.variant
-      output.message["thinking"] = { ...ULTRAWORK_THINKING_CONFIG }
     }
     return
   }