fix(pi): converge worker failures and thinking state

shared/imported-model-profile.ts

@@ -1,5 +1,15 @@
 export type ImportedModelModality = 'text' | 'audio' | 'image' | 'pdf';
 export type ImportedVisionTokenEstimator = 'qwen-32px-grid';
+export type ImportedThinkingLevel = 'off' | 'minimal' | 'low' | 'medium' | 'high';
+
+export interface ImportedPiModelProfile {
+  reasoning: boolean;
+  thinkingLevelMap?: Partial<Record<ImportedThinkingLevel, string | null>>;
+  compat?: {
+    thinkingFormat?: 'deepseek' | 'openrouter';
+    requiresReasoningContentOnAssistantMessages?: boolean;
+  };
+}
 
 export interface ImportedModelProfile {
   modalities: {
@@ -11,6 +21,7 @@ export interface ImportedModelProfile {
     output: number;
   };
   visionTokenEstimator?: ImportedVisionTokenEstimator;
+  pi?: ImportedPiModelProfile;
 }
 
 const VERIFIED_QWEN_PLUS_MODEL_IDS = new Set([
@@ -31,6 +42,32 @@ function imageModalities(): ImportedModelProfile['modalities'] {
 
 export function getImportedModelProfile(rawModelId: string): ImportedModelProfile | null {
   const modelId = rawModelId.trim();
+  if (modelId.toLowerCase() === 'deepseek-v4-pro') {
+    return {
+      modalities: {
+        input: ['text'],
+        output: ['text'],
+      },
+      limit: {
+        context: 1_000_000,
+        output: 384_000,
+      },
+      pi: {
+        reasoning: true,
+        thinkingLevelMap: {
+          off: null,
+          minimal: null,
+          low: null,
+          medium: null,
+          high: 'high',
+        },
+        compat: {
+          thinkingFormat: 'deepseek',
+          requiresReasoningContentOnAssistantMessages: true,
+        },
+      },
+    };
+  }
   if (VERIFIED_QWEN_PLUS_MODEL_IDS.has(modelId.toLowerCase())) {
     return {
       modalities: imageModalities(),