refactor: remove bash pty mode

src/agents/bash-process-registry.ts

@@ -1,5 +1,4 @@
 import type { ChildProcessWithoutNullStreams } from "node:child_process";
-import type { IPty } from "node-pty";
 
 const DEFAULT_JOB_TTL_MS = 30 * 60 * 1000; // 30 minutes
 const MIN_JOB_TTL_MS = 60 * 1000; // 1 minute
@@ -16,15 +15,11 @@ let jobTtlMs = clampTtl(
 
 export type ProcessStatus = "running" | "completed" | "failed" | "killed";
 
-export type ProcessStdinMode = "pipe" | "pty";
-
 export interface ProcessSession {
   id: string;
   command: string;
   child?: ChildProcessWithoutNullStreams;
-  pty?: IPty;
   pid?: number;
-  stdinMode: ProcessStdinMode;
   startedAt: number;
   cwd?: string;
   maxOutputChars: number;