New tooling

Entry: scripts/run-bin.mjs
Preload shim (must load first): scripts/run-bin-prelude.mjs
Harness: scripts/lib/run-bin-harness.mjs

Usage:

node scripts/run-bin.mjs ls -la /bin
node scripts/run-bin.mjs cat /etc/passwd
node scripts/run-bin.mjs --cmd sed -n '1,5p' /home/user/note.txt
node scripts/run-bin.mjs --json echo "hello"
printf 'a\nb\n' | node scripts/run-bin.mjs cat
npm run test:coreutils -- --suite basic
npm run test:coreutils -- --build --watch -- echo test   # rebuild + watch src/<cmd>.js (use `--buil

test/fixtures/coreutils/basic.suite.json

@@ -0,0 +1,51 @@
+{
+  "schema": 1,
+  "cases": [
+    {
+      "id": "echo-text",
+      "argv": ["echo", "bare-os-run-bin"],
+      "expect": {
+        "exitCode": 0,
+        "stdoutIncludes": "bare-os-run-bin"
+      }
+    },
+    {
+      "id": "pwd-root",
+      "argv": ["pwd"],
+      "expect": {
+        "exitCode": 0,
+        "stdoutIncludes": "/"
+      }
+    },
+    {
+      "id": "true-exit",
+      "argv": ["true"],
+      "expect": {
+        "exitCode": 0
+      }
+    },
+    {
+      "id": "false-exit",
+      "argv": ["false"],
+      "expect": {
+        "exitCode": 1
+      }
+    },
+    {
+      "id": "cat-note",
+      "argv": ["cat", "/home/user/note.txt"],
+      "expect": {
+        "exitCode": 0,
+        "stdoutIncludes": "hello from fixture layout"
+      }
+    },
+    {
+      "id": "grep-home",
+      "argv": ["grep", "hello", "/home/user/note.txt"],
+      "expect": {
+        "exitCode": 0,
+        "stdoutIncludes": "hello"
+      }
+    }
+  ]
+}

test/fixtures/coreutils/overlays/with-extra/home/user/extra.txt

@@ -0,0 +1 @@
+optional overlay file for suites that set "fixture": "with-extra"