feat: throttle Neon transfer with smaller batches + 1s delay

Reduce BATCH_SIZE from 200 to 100 and add a 1-second pause between
batches to avoid overwhelming the Neon production database during
large incremental syncs.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/transfer-enriched-to-neon.ts

@@ -113,7 +113,7 @@ async function main() {
       console.log(`🔄 Incremental filter: updatedAt > ${transferSince.toISOString()}\n`);
     }
 
-    const BATCH_SIZE = 200;
+    const BATCH_SIZE = 100;
     const totalCount = await nasPrisma.church.count({ where: whereClause });
 
     console.log(`Found ${totalCount} enriched churches (will process in batches of ${BATCH_SIZE})\n`);
@@ -270,6 +270,9 @@ async function main() {
           console.error(`Error transferring ${church.name}:`, error instanceof Error ? error.message : error);
         }
       }
+
+      // Brief pause between batches to avoid overwhelming Neon
+      await new Promise(resolve => setTimeout(resolve, 1000));
       } // end batch loop
 
       console.log('\n════════════════════════════════════════════════════════════');