[FEATURE]: bash completions

[strk]

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

Reading the documentation I'm suggested to type opencode auth login but I'm lazy so I used "openc" which completed to "opencode " and then tried "opencode " which did not suggest "auth".

For a terminal based tool it would be nice to have those tab-completions

Reference (it feels like a lot of work to lookup, when LLMs would probably implement it right away, but I'm old school): https://www.gnu.org/software/gnuastro/manual/html_node/Bash-TAB-completion-tutorial.html

[github-actions]

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

• Feature request: cli tab completions for bash, fish, and zsh #1515: Feature request for CLI completions for bash, fish, and zsh - this is essentially the same request for shell completion functionality
• FEATURE REQUEST Tab completion #2701: Feature request for tab completion (closed but addresses similar functionality)

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

[strk]

I confirm this is a duplicate of #1515