fix: restore Claude tool call ID normalization from upstream

The normalizeMessages function in transform.ts was missing a block that
normalizes tool call IDs for Claude models. This block exists in the
upstream OpenCode repo but was inadvertently removed in our fork.

The normalization replaces any characters that are not alphanumeric,
underscore, or hyphen with underscores in toolCallId fields. This
prevents Claude from rejecting messages with tool call IDs containing
invalid characters.

packages/opencode/src/provider/transform.ts

@@ -72,6 +72,23 @@ export namespace ProviderTransform {
         .filter((msg): msg is ModelMessage => msg !== undefined && msg.content !== "")
     }
 
+    if (model.api.id.includes("claude")) {
+      return msgs.map((msg) => {
+        if ((msg.role === "assistant" || msg.role === "tool") && Array.isArray(msg.content)) {
+          msg.content = msg.content.map((part) => {
+            if ((part.type === "tool-call" || part.type === "tool-result") && "toolCallId" in part) {
+              return {
+                ...part,
+                toolCallId: part.toolCallId.replace(/[^a-zA-Z0-9_-]/g, "_"),
+              }
+            }
+            return part
+          })
+        }
+        return msg
+      })
+    }
+
     if (
       model.providerID === "mistral" ||
       model.api.id.toLowerCase().includes("mistral") ||