feat(providers): Add Anthropic extended thinking and adapt providers to new streaming/file APIs; bump dependencies and update docs, tests and configuration

ts/provider.anthropic.ts

@@ -317,7 +317,11 @@ export class AnthropicProvider extends MultiModalModel {
       const maxTokens = optionsArg.searchDepth === 'deep' ? 20000 :
                         optionsArg.searchDepth === 'advanced' ? 20000 : 20000;
 
+      // Add thinking configuration if enabled
+      const thinkingConfig = this.getThinkingConfig();
+
       // Create the research request
+      // Note: When thinking is enabled, temperature must be 1 (or omitted)
       const requestParams: any = {
         model: 'claude-sonnet-4-5-20250929',
         system: systemMessage,
@@ -328,7 +332,8 @@ export class AnthropicProvider extends MultiModalModel {
           }
         ],
         max_tokens: maxTokens,
-        temperature: 0.7
+        // Only set temperature when thinking is NOT enabled
+        ...(thinkingConfig ? {} : { temperature: 0.7 })
       };
 
       // Add tools if web search is enabled
@@ -337,7 +342,6 @@ export class AnthropicProvider extends MultiModalModel {
       }
 
       // Add thinking configuration if enabled
-      const thinkingConfig = this.getThinkingConfig();
       if (thinkingConfig) {
         requestParams.thinking = thinkingConfig;
       }