[alexandre-dos-reis]

Adds fish as a third runtime completion shell alongside bash and zsh, generating a send_completions_fish adapter loadable with cli completions fish | source.

[DannyBen]

Thanks for the contribution! This fits well with the existing completion adapters and tests. Could you address these two small items?

• Add fish alongside zsh in the CI test workflow.
• Fix the ShellCheck SC2028 warning by adjusting the output statement—for example, using printf '%s\n' instead of echo—rather than suppressing the warning.

The schema validation failure appears unrelated; it failed during dependency installation.

Once these are addressed, we can take over any remaining adjustments and finalize the PR.

[DannyBen]

Let me know when it is ready to merge. Ignore the JSON schema CI failure, I will deal with it later.

[alexandre-dos-reis]

I think this PR is done, I have tested the completions myself with fish 4.7.1.

Thanks for your guidance.

[DannyBen]

Thanks for this. It will be a part of 2.0.1.