diff --git a/scripts/operator_notify_bridge_supervisor.mjs b/scripts/operator_notify_bridge_supervisor.mjs
new file mode 100644
index 0000000..0fcd4f5
--- /dev/null
+++ b/scripts/operator_notify_bridge_supervisor.mjs
@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+
+import '../plugins/reporting-governance/scripts/operator_notify_bridge_supervisor.mjs';
diff --git a/scripts/test_operator_notify_bridge_supervisor.mjs b/scripts/test_operator_notify_bridge_supervisor.mjs
new file mode 100644
index 0000000..a8e17f8
--- /dev/null
+++ b/scripts/test_operator_notify_bridge_supervisor.mjs
@@ -0,0 +1,149 @@
+#!/usr/bin/env node
+
+import assert from 'node:assert/strict';
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import path from 'node:path';
+import process from 'node:process';
+import { spawnSync } from 'node:child_process';
+
+const ROOT_DIR = path.resolve(import.meta.dirname, '..');
+const REPO_SHIM = path.join(ROOT_DIR, 'scripts', 'operator_notify_bridge_supervisor.mjs');
+const PACKAGE_ENTRY = path.join(ROOT_DIR, 'plugins', 'reporting-governance', 'scripts', 'operator_notify_bridge_supervisor.mjs');
+
+function createFixture() {
+  const fixtureRoot = mkdtempSync(path.join(tmpdir(), 'operator-notify-bridge-supervisor-shim-regression-'));
+  const queueDir = path.join(fixtureRoot, 'queue');
+  const spoolDir = path.join(fixtureRoot, 'spool');
+  const receiptDir = path.join(fixtureRoot, 'receipts');
+  const attemptDir = path.join(fixtureRoot, 'attempts');
+  [queueDir, spoolDir, receiptDir, attemptDir].forEach((dir) => mkdirSync(dir, { recursive: true }));
+
+  const queuePath = path.join(queueDir, 'queue-item.json');
+  writeFileSync(queuePath, `${JSON.stringify({
+    notification_id: 'notify-supervisor-shim-regression-1',
+    status: 'dispatched',
+    dispatch_result: { state: 'dispatched', mode: 'spool_only' },
+  }, null, 2)}\n`, 'utf8');
+
+  const spoolPath = path.join(spoolDir, 'notify-supervisor-shim-regression-1-dispatch.json');
+  writeFileSync(spoolPath, `${JSON.stringify({
+    notification_id: 'notify-supervisor-shim-regression-1',
+    queue_item_path: queuePath,
+    dispatch_contract: {
+      executor: 'message.send',
+      channel: 'telegram',
+      target: '864811879',
+      message: 'watchdog overdue',
+    },
+  }, null, 2)}\n`, 'utf8');
+
+  return { fixtureRoot, queueDir, spoolDir, receiptDir, attemptDir };
+}
+
+function run(script, args = []) {
+  const result = spawnSync(process.execPath, [script, ...args], {
+    cwd: ROOT_DIR,
+    encoding: 'utf8',
+  });
+  return {
+    status: result.status,
+    stdout: result.stdout ?? '',
+    stderr: result.stderr ?? '',
+  };
+}
+
+const tests = [];
+function test(name, fn) { tests.push({ name, fn }); }
+function printResult(prefix, name, detail = '') { process.stdout.write(`${prefix} ${name}${detail ? ` ${detail}` : ''}\n`); }
+
+function scrub(value) {
+  if (Array.isArray(value)) return value.map(scrub);
+  if (!value || typeof value !== 'object') return value;
+
+  const next = {};
+  for (const [key, raw] of Object.entries(value)) {
+    if (typeof raw === 'string') {
+      if (key.toLowerCase().includes('path') || key.toLowerCase().endsWith('dir')) {
+        next[key] = '<path>';
+        continue;
+      }
+      if (key === 'notificationId' || key === 'notification_id') {
+        next[key] = '<notification-id>';
+        continue;
+      }
+      if (key === 'created_at' || key === 'now') {
+        next[key] = '<iso>';
+        continue;
+      }
+    }
+    next[key] = scrub(raw);
+  }
+  return next;
+}
+
+function normalizeStdout(stdout) {
+  return scrub(JSON.parse(stdout));
+}
+
+function buildArgs(fixture) {
+  return [
+    '--queue-dir', fixture.queueDir,
+    '--spool-dir', fixture.spoolDir,
+    '--receipt-dir', fixture.receiptDir,
+    '--dispatcher-script', path.join(ROOT_DIR, 'scripts', 'operator_notify_dispatcher.mjs'),
+    '--sender-command', `${JSON.stringify(process.execPath)} ${JSON.stringify(path.join(ROOT_DIR, 'scripts', 'operator_notify_sender_binding.mjs'))} --mode shim --attempt-dir ${JSON.stringify(fixture.attemptDir)} --compact`,
+    '--now', '2026-05-07T10:02:00.000Z',
+    '--compact',
+  ];
+}
+
+test('repo-root shim forwards help text and exits like package entrypoint', () => {
+  const shim = run(REPO_SHIM, ['--help']);
+  const pkg = run(PACKAGE_ENTRY, ['--help']);
+  assert.equal(shim.status, 0);
+  assert.equal(pkg.status, 0);
+  assert.equal(shim.stderr, '');
+  assert.equal(pkg.stderr, '');
+  assert.equal(shim.stdout, pkg.stdout);
+});
+
+test('repo-root shim forwards args and preserves success payload semantics', () => {
+  const shimFixture = createFixture();
+  const pkgFixture = createFixture();
+  try {
+    const shim = run(REPO_SHIM, buildArgs(shimFixture));
+    const pkg = run(PACKAGE_ENTRY, buildArgs(pkgFixture));
+    assert.equal(shim.status, 0, shim.stderr);
+    assert.equal(pkg.status, 0, pkg.stderr);
+    assert.deepEqual(normalizeStdout(shim.stdout), normalizeStdout(pkg.stdout));
+  } finally {
+    rmSync(shimFixture.fixtureRoot, { recursive: true, force: true });
+    rmSync(pkgFixture.fixtureRoot, { recursive: true, force: true });
+  }
+});
+
+test('repo-root shim preserves non-zero exit semantics from package core', () => {
+  const shim = run(REPO_SHIM, ['--now', 'not-an-iso']);
+  const pkg = run(PACKAGE_ENTRY, ['--now', 'not-an-iso']);
+  assert.equal(shim.status, 1);
+  assert.equal(pkg.status, 1);
+  assert.equal(shim.stdout, '');
+  assert.equal(pkg.stdout, '');
+  assert.equal(shim.stderr, pkg.stderr);
+});
+
+let failures = 0;
+for (const { name, fn } of tests) {
+  try {
+    fn();
+    printResult('ok', name);
+  } catch (error) {
+    failures += 1;
+    printResult('not ok', name, `- ${error instanceof Error ? error.message : String(error)}`);
+  }
+}
+
+if (failures > 0) {
+  process.exit(1);
+}