Add initial implementation of PolinRider malware scanner

- Introduced core files including Dockerfile, action.yml, and entry point script (bin/polinrider.js) for the PolinRider malware scanner.
- Created configuration files: .env.example, .gitignore, and .npmrc for environment setup and dependency management.
- Added CI workflows for testing, building, and releasing the action, along with examples for usage in GitHub Actions.
- Implemented a README.md to provide documentation on usage, features, and setup instructions.
- Included necessary scripts for building the action and handling security measures during execution.
- Established a structured directory for reports and workspace management within Docker.
- Ensured all files are set up for a secure and efficient scanning process of GitHub repositories for PolinRider malware.

test/safety.test.js

@@ -0,0 +1,33 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { execa } from "execa";
+import { fileURLToPath } from "node:url";
+
+const probe = fileURLToPath(new URL("./_safety-probe.mjs", import.meta.url));
+const entry = fileURLToPath(new URL("../src/index.js", import.meta.url));
+
+test("Layer 3 in-code guards block eval / Function / vm / process.binding", async () => {
+  const r = await execa(process.execPath, [probe], { reject: false });
+  assert.equal(r.exitCode, 0, r.stderr || r.stdout);
+  assert.match(r.stdout, /safety-probe OK/);
+});
+
+test("Layer 2 V8 flag also blocks codegen (defense in depth)", async () => {
+  const r = await execa(process.execPath, ["--disallow-code-generation-from-strings", probe], {
+    reject: false,
+  });
+  assert.equal(r.exitCode, 0, r.stderr || r.stdout);
+});
+
+test("orchestrator imports cleanly under the hardening flag (dependency canary)", async () => {
+  // Import index.js (without running main) under the flag. If execa/chalk/ora or
+  // any transitive dep needs eval/new Function at import time, this exits non-zero.
+  const code = `await import(${JSON.stringify(entry)}); console.log("import OK");`;
+  const r = await execa(
+    process.execPath,
+    ["--disallow-code-generation-from-strings", "--input-type=module", "-e", code],
+    { reject: false },
+  );
+  assert.equal(r.exitCode, 0, r.stderr || r.stdout);
+  assert.match(r.stdout, /import OK/);
+});