Add account based multiplayer hosting and bug report retention

lib/bug-retention.ts

@@ -0,0 +1,38 @@
+import type { BugReportRecord } from "../shared/bug-reports";
+import type { LinearSupportClient } from "./linear-support-client";
+
+export async function purgeClosedBugReport(
+  id: string,
+  closedAt: string,
+  deps: {
+    record: () => Promise<BugReportRecord | null>;
+    linear: Pick<LinearSupportClient, "issue" | "remove">;
+    begin: () => Promise<boolean>;
+    reopen: () => Promise<void>;
+    removeFiles: (paths: string[]) => Promise<void>;
+    finish: () => Promise<void>;
+    now?: () => number;
+  },
+) {
+  const report = await deps.record();
+  if (
+    !report ||
+    report.state !== "done" ||
+    report.closed_at !== closedAt ||
+    !report.delete_after ||
+    Date.parse(report.delete_after) > (deps.now ?? Date.now)()
+  )
+    return;
+  if (!report.purge_started_at) {
+    const issue = await deps.linear.issue(id);
+    if (issue && issue.state?.type !== "completed") {
+      await deps.reopen();
+      return;
+    }
+  }
+  if (!(await deps.begin())) return;
+  // Keep the local retry record until BOTH external deletions are confirmed.
+  await deps.linear.remove(id);
+  await deps.removeFiles([`${id}/input`, `${id}/screenshot.webp`]);
+  await deps.finish();
+}