add anthropic/ provider prefix for claude models, preserve date suffixes, passthrough provider-prefixed models

src/features/claude-code-agent-loader/claude-model-mapper.ts

@@ -1,6 +1,6 @@
 import { normalizeModelID } from "../../shared/model-normalization"
 
-const DATE_SUFFIX_PATTERN = /-\d{8}$/
+const ANTHROPIC_PREFIX = "anthropic/"
 
 export function mapClaudeModelToOpenCode(model: string | undefined): string | undefined {
   if (!model) return undefined
@@ -8,6 +8,15 @@ export function mapClaudeModelToOpenCode(model: string | undefined): string | un
   const trimmed = model.trim()
   if (trimmed.length === 0) return undefined
 
-  const withoutDate = trimmed.replace(DATE_SUFFIX_PATTERN, "")
-  return normalizeModelID(withoutDate)
+  if (trimmed.includes("/")) {
+    return trimmed
+  }
+
+  const normalized = normalizeModelID(trimmed)
+
+  if (normalized.startsWith("claude-")) {
+    return `${ANTHROPIC_PREFIX}${normalized}`
+  }
+
+  return normalized
 }