chore: remove retired native login paths

src/services/native-login-handoff.ts

@@ -1,28 +0,0 @@
-export interface NativeLoginHandoff {
-  request(): void;
-}
-
-export interface ProcessNativeLoginHandoffOptions {
-  exitCode?: number;
-  delayMs?: number;
-  exit?: (code: number) => void;
-}
-
-export class ProcessNativeLoginHandoff implements NativeLoginHandoff {
-  private requested = false;
-  private readonly exitCode: number;
-  private readonly delayMs: number;
-  private readonly exit: (code: number) => void;
-
-  constructor(options: ProcessNativeLoginHandoffOptions = {}) {
-    this.exitCode = options.exitCode ?? 75;
-    this.delayMs = options.delayMs ?? 250;
-    this.exit = options.exit ?? ((code) => process.exit(code));
-  }
-
-  request(): void {
-    if (this.requested) return;
-    this.requested = true;
-    setTimeout(() => this.exit(this.exitCode), this.delayMs).unref();
-  }
-}