Clean up encoding output to show only hex string

- Remove verbose "Encoded EXI data (X bytes):" message
- Terminal output now shows only clean hex string
- File redirection maintains binary output functionality
- Streamlined user experience for hex data copying

🤖 Generated with [Claude Code](https://claude.ai/code)

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

enhanced_exi_viewer.c

@@ -1036,13 +1036,11 @@ int main(int argc, char *argv[]) {
         }
         
         if (use_hex_output) {
-            // Terminal output: show hex string
+            // Terminal output: show hex string only
-            printf("Encoded EXI data (%zu bytes):\n", pos);
             for(size_t i = 0; i < pos; i++) {
                 printf("%02X", buffer[i]);
-                if ((i + 1) % 32 == 0) printf("\n");
             }
-            if (pos % 32 != 0) printf("\n");
+            printf("\n");
         } else {
             // Redirected output: write binary data
             fwrite(buffer, 1, pos, stdout);