fix(drive-record-traces): eliminate bare as-cast in parsePayload

Factor the object-shape check into an isRecord type predicate so
TypeScript narrows parsed to Record<string,unknown> without a cast.
Keeps identical behaviour and error messages.

Signed-off-by: Will Madden <madden@prisma.io>

Author: wmadden

skills-contrib/drive-record-traces/emit.ts

@@ -68,17 +68,21 @@ function fail(message: string): never {
   process.exit(1);
 }
 
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null && !Array.isArray(value);
+}
+
 function parsePayload(raw: string): Record<string, unknown> {
   let parsed: unknown;
   try {
     parsed = JSON.parse(raw);
   } catch (err) {
     fail(`--payload is not valid JSON: ${err instanceof Error ? err.message : String(err)}`);
   }
-  if (typeof parsed !== 'object' || parsed === null || Array.isArray(parsed)) {
+  if (!isRecord(parsed)) {
     fail('--payload must be a JSON object');
   }
-  return parsed as Record<string, unknown>;
+  return parsed;
 }
 
 function main(): void {