Fix --executable scripts when created with non-installed ursa

Give an error if we try to create an executable script with the
test-run.sh development shim.

Also uncomment some tear-down in the test of executable scripts.

src/ursa/cli.ts

@@ -299,7 +299,10 @@ async function compileCommand(args: Args) {
   let output = ''
   if (args.target === 'ark') {
     if (args.executable) {
-      output += '#!/usr/bin/env -S ursa --syntax=json run\n'
+      if (path.basename(process.argv[1]) === 'cli.ts') {
+        throw new Error('Cannot create executable from test-run.sh')
+      }
+      output += `#!/usr/bin/env -S ${process.argv0} --no-warnings ${process.argv[1]} --syntax=json run\n`
     }
     output += serializeVal(exp)
   } else {

src/ursa/examples.test.ts

@@ -78,7 +78,7 @@ ursaTest('Anagrams', 'rosettacode/Anagrams', ['rosettacode/unixdict.txt'])
 test('Executable scripts', async (t) => {
   for (const target of ['ark', 'js']) {
     const tempExecFile = tmp.fileSync({discardDescriptor: true})
-    // t.teardown(() => tempExecFile.removeCallback())
+    t.teardown(() => tempExecFile.removeCallback())
     await execa(ursaCommand, [
       `--target=${target}`,
       'compile', '--executable', 'test/advent-of-code-2023-day-25.ursa',