Recover from daemon hello timeout

[Jinwoo-H]

Summary

• add a timeout for daemon hello handshakes after socket connect
• classify hello timeout as a wedged-daemon condition so the existing respawn/retry path runs
• cover the no-hello handshake case in daemon client tests

Why

A daemon can accept the socket but fail to complete the protocol hello. Before this, terminal spawn could wait forever, leaving a mounted pane with no live transport and a blank blinking cursor.

Test plan

• pnpm exec oxlint src/main/daemon/client.ts src/main/daemon/client.test.ts src/main/daemon/daemon-pty-adapter.ts --format github
• pnpm test src/main/daemon/client.test.ts src/main/daemon/daemon-pty-adapter.test.ts
• git diff --check