attach does not accept --auto permission mode

[thisisryanswift]

Description

opencode attach rejects --auto, although the regular TUI supports that flag and an attached TUI can enable the same mode from the command palette. Attach should accept --auto and initialize the TUI permission mode consistently.

Plugins

None

OpenCode version

1.17.13

Steps to reproduce

1. Start an OpenCode server.
2. Run opencode attach <url> --auto.
3. Observe that attach prints its help and exits because --auto is unknown.

opencode <project> --auto accepts the same option.

[github-actions]

This issue might be a duplicate of (or closely related to) an existing issue. Please check:

• opencode attach --mini ignores --agent/--model flags #38483: Same root cause — opencode attach is missing flags that the main TUI supports. That issue covers --agent and --model; this issue covers --auto. The fix likely touches the same place in attach.ts.