Support for running commands that use raw mode stdin

[chebykinn]

Currently, if I try to run a command that uses raw mode for TUI, it would either fail or hang the whole interface. I want to be able to open them and return back to the opencode UI.

[rekram1-node]

[automated] Closing due to 90+ days of inactivity. Feel free to reopen if you still need this!

[ericvicenti]

Hey, this issue is still super relevant. We should be able to utilize interactive commands within opencode! Currently, as far as I'm aware:

1. we cannot see the streamed output until after it exits
2. the user has no way to input keystrokes or stdin during an interactive command
3. I'm not sure, but it seems that the agent has no way to input keystrokes during a long-running command

[rekram1-node]

For 1. that's not accurate? Dont think
2. Yeah on the list
3. Tell it to use tmux