fix: fail closed on unusable Codex auth during sandbox auth merge

When reusing a Codex sandbox, the workspace-restore step now performs
an auth-merge check before adopting the sandbox's auth.json. The merge
fails closed when:

- host or sandbox Codex auth is unusable (missing token or account)
- the subscription payload shapes differ between host and sandbox
- subscription account identities do not match

Additional hardening: node absence on PATH during the embedded decision
script now exits non-zero instead of silently falling through. Co-change
comments link parseAuth (the embedded script) to hasUsableAuthPayload
(codex-home.ts) so a future auth-format change cannot silently diverge
between the two implementations.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/dev-service.ts

@@ -0,0 +1,44 @@
+#!/usr/bin/env -S node --import tsx
+import { listLocalServiceRegistryRecords, removeLocalServiceRegistryRecord, terminateLocalService } from "../server/src/services/local-service-supervisor.ts";
+import { repoRoot } from "./dev-service-profile.ts";
+
+function toDisplayLines(records: Awaited<ReturnType<typeof listLocalServiceRegistryRecords>>) {
+  return records.map((record) => {
+    const childPid = typeof record.metadata?.childPid === "number" ? ` child=${record.metadata.childPid}` : "";
+    const url = typeof record.metadata?.url === "string" ? ` url=${record.metadata.url}` : "";
+    return `${record.serviceName} pid=${record.pid}${childPid} cwd=${record.cwd}${url}`;
+  });
+}
+
+const command = process.argv[2] ?? "list";
+const records = await listLocalServiceRegistryRecords({
+  profileKind: "paperclip-dev",
+  metadata: { repoRoot },
+});
+
+if (command === "list") {
+  if (records.length === 0) {
+    console.log("No Paperclip dev services registered for this repo.");
+    process.exit(0);
+  }
+  for (const line of toDisplayLines(records)) {
+    console.log(line);
+  }
+  process.exit(0);
+}
+
+if (command === "stop") {
+  if (records.length === 0) {
+    console.log("No Paperclip dev services registered for this repo.");
+    process.exit(0);
+  }
+  for (const record of records) {
+    await terminateLocalService(record);
+    await removeLocalServiceRegistryRecord(record.serviceKey);
+    console.log(`Stopped ${record.serviceName} (pid ${record.pid})`);
+  }
+  process.exit(0);
+}
+
+console.error(`Unknown dev-service command: ${command}`);
+process.exit(1);