[FEATURE]: Support for `--dir` with `opencode run` for both local and remote sessions

[BlankParticle]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

The attach command supports --dir to specify the working directory, but run doesn't have this option when using --attach.

It would be useful to have --dir on run for both:

• Local runs: change to that directory before starting
• Remote runs with --attach: pass the directory to the remote server

Example usage:

opencode run --dir /path/to/project "do something"
opencode run --attach http://localhost:4096 --dir /path/to/project "do something"

I already made the PR before realising I needed the issue, #12443

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Create session with a different root/working directory #1143: Create session with a different root/working directory
• Allow explicitly changing working directory #2177: Allow explicitly changing working directory
• [FEATURE]:Use attach to reference a local directory. #10615: [FEATURE]:Use attach to reference a local directory.
• opencode attach --dir does not use project commands #11046: opencode attach --dir does not use project commands

Feel free to ignore if none of these address your specific case.