chore(provider): add claude-sonnet-4-6 model to anthropic and vertex providers (#2422)

Author: amitksingh1490

crates/forge_repo/src/provider/provider.json

@@ -503,6 +503,16 @@
     "response_type": "Anthropic",
     "url": "https://api.anthropic.com/v1/messages",
     "models": [
+      {
+        "id": "claude-sonnet-4-6",
+        "name": "Claude Sonnet 4.6",
+        "description": "Most balanced model for building agents and coding",
+        "context_length": 200000,
+        "tools_supported": true,
+        "supports_parallel_tool_calls": true,
+        "supports_reasoning": true,
+        "input_modalities": ["text", "image"]
+      },
       {
         "id": "claude-opus-4-6",
         "name": "Claude Opus 4.6",
@@ -1604,7 +1614,17 @@
     "response_type": "Anthropic",
     "url": "{{#if (eq LOCATION \"global\")}}https://aiplatform.googleapis.com/v1/projects/{{PROJECT_ID}}/locations/{{LOCATION}}/publishers/anthropic/models/{{else}}https://{{LOCATION}}-aiplatform.googleapis.com/v1/projects/{{PROJECT_ID}}/locations/{{LOCATION}}/publishers/anthropic/models/{{/if}}",
     "models": [
+
       {
+        "id": "claude-sonnet-4-6",
+        "name": "Claude Sonnet 4.6",
+        "description": "Most balanced Claude model with excellent performance and speed",
+        "context_length": 200000,
+        "tools_supported": true,
+        "supports_parallel_tool_calls": true,
+        "supports_reasoning": true,
+        "input_modalities": ["text", "image"]
+      },{
         "id": "claude-opus-4-6",
         "name": "Claude Opus 4.6",
         "description": "Most capable Claude model with enhanced reasoning and analysis capabilities",