assembler / cardiograph - Add shebangs

src/assembler.js

@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 const fs = require('fs');
 
 const { logMemory, num2hex } = require('./logging.js');

src/cardiograph.js

@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 const DBG = require('./dbg.js');
 const { num2hex, bool2bit } = require('./logging.js');