Merge pull request #322 from ben-vargas/feat-claude-opus-4-5

feat(registry): add Claude Opus 4.5 model definition

internal/registry/model_definitions.go

@@ -23,6 +23,17 @@ func GetClaudeModels() []*ModelInfo {
 			Type:        "claude",
 			DisplayName: "Claude 4.5 Sonnet",
 		},
+		{
+			ID:                  "claude-opus-4-5-20251101",
+			Object:              "model",
+			Created:             1761955200, // 2025-11-01
+			OwnedBy:             "anthropic",
+			Type:                "claude",
+			DisplayName:         "Claude 4.5 Opus",
+			Description:         "Premium model combining maximum intelligence with practical performance",
+			ContextLength:       200000,
+			MaxCompletionTokens: 64000,
+		},
 		{
 			ID:          "claude-opus-4-1-20250805",
 			Object:      "model",