fix(shared): normalize claude model IDs for anthropic provider (#3290)

Anthropic API accepts claude-opus-4.6 (dot format) but not
claude-opus-4-6 (dash format). Added anthropic case to
transformModelForProvider to normalize dash-format model IDs before
they reach the provider. Updated model config snapshots and test
expectations to match the new dot-format output.

🤖 Generated with OhMyOpenCode assistance
https://github.com/code-yeongyu/oh-my-opencode

src/shared/provider-model-id-transform.ts

@@ -14,5 +14,11 @@ export function transformModelForProvider(provider: string, model: string): stri
 			.replace(/gemini-3\.1-pro(?!-)/g, "gemini-3.1-pro-preview")
 			.replace(/gemini-3-flash(?!-)/g, "gemini-3-flash-preview")
 	}
+	if (provider === "anthropic") {
+		return model
+			.replace("claude-opus-4-6", "claude-opus-4.6")
+			.replace("claude-sonnet-4-6", "claude-sonnet-4.6")
+			.replace("claude-haiku-4-5", "claude-haiku-4.5")
+	}
 	return model
 }