feat: update Claude model to Opus 4.6 and enhance adaptive thinking support

- Changed model identifier from `claude-opus-4-5-20251101` to `claude-opus-4-6` across various files, including documentation and code references.
- Updated the SDK to support adaptive thinking for Opus 4.6, allowing the model to determine its own reasoning depth.
- Enhanced the thinking level options to include 'adaptive' and adjusted related components to reflect this change.
- Updated tests to ensure compatibility with the new model and its features.

These changes improve the model's capabilities and user experience by leveraging adaptive reasoning.

docs/llm-shared-packages.md

@@ -142,7 +142,7 @@ const modelId = resolveModelString('sonnet'); // → 'claude-sonnet-4-20250514'
 
 - `haiku` → `claude-haiku-4-5` (fast, simple tasks)
 - `sonnet` → `claude-sonnet-4-20250514` (balanced, recommended)
-- `opus` → `claude-opus-4-5-20251101` (maximum capability)
+- `opus` → `claude-opus-4-6` (maximum capability)
 
 ### @automaker/dependency-resolver
 

docs/server/providers.md

@@ -175,7 +175,7 @@ Uses `@anthropic-ai/claude-agent-sdk` for direct SDK integration.
 
 Routes models that:
 
-- Start with `"claude-"` (e.g., `"claude-opus-4-5-20251101"`)
+- Start with `"claude-"` (e.g., `"claude-opus-4-6"`)
 - Are Claude aliases: `"opus"`, `"sonnet"`, `"haiku"`
 
 #### Authentication
@@ -191,7 +191,7 @@ const provider = new ClaudeProvider();
 
 const stream = provider.executeQuery({
   prompt: 'What is 2+2?',
-  model: 'claude-opus-4-5-20251101',
+  model: 'claude-opus-4-6',
   cwd: '/project/path',
   systemPrompt: 'You are a helpful assistant.',
   maxTurns: 20,
@@ -701,7 +701,7 @@ Test provider interaction with services:
 ```typescript
 describe('Provider Integration', () => {
   it('should work with AgentService', async () => {
-    const provider = ProviderFactory.getProviderForModel('claude-opus-4-5-20251101');
+    const provider = ProviderFactory.getProviderForModel('claude-opus-4-6');
 
     // Test full workflow
   });

docs/server/utilities.md

@@ -213,7 +213,7 @@ Model alias mapping for Claude models.
 export const CLAUDE_MODEL_MAP: Record<string, string> = {
   haiku: 'claude-haiku-4-5',
   sonnet: 'claude-sonnet-4-20250514',
-  opus: 'claude-opus-4-5-20251101',
+  opus: 'claude-opus-4-6',
 } as const;
 ```
 
@@ -223,7 +223,7 @@ Default models per provider.
 
 ```typescript
 export const DEFAULT_MODELS = {
-  claude: 'claude-opus-4-5-20251101',
+  claude: 'claude-opus-4-6',
   openai: 'gpt-5.2',
 } as const;
 ```
@@ -248,8 +248,8 @@ Resolve a model key/alias to a full model string.
 import { resolveModelString, DEFAULT_MODELS } from '../lib/model-resolver.js';
 
 resolveModelString('opus');
-// Returns: "claude-opus-4-5-20251101"
-// Logs: "[ModelResolver] Resolved model alias: "opus" -> "claude-opus-4-5-20251101""
+// Returns: "claude-opus-4-6"
+// Logs: "[ModelResolver] Resolved model alias: "opus" -> "claude-opus-4-6""
 
 resolveModelString('gpt-5.2');
 // Returns: "gpt-5.2"
@@ -260,8 +260,8 @@ resolveModelString('claude-sonnet-4-20250514');
 // Logs: "[ModelResolver] Using full Claude model string: claude-sonnet-4-20250514"
 
 resolveModelString('invalid-model');
-// Returns: "claude-opus-4-5-20251101"
-// Logs: "[ModelResolver] Unknown model key "invalid-model", using default: "claude-opus-4-5-20251101""
+// Returns: "claude-opus-4-6"
+// Logs: "[ModelResolver] Unknown model key "invalid-model", using default: "claude-opus-4-6""
 ```
 
 ---