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Summary

Fixes #6940

In zsh, completions work with the netlify command, but not with the ntl alias. Trying to use tab with ntl does not produce any completions in zsh.

The reason for this is that shell completions are command-specific and do not automatically propagate to aliases without explicit configuration in either the completion script or the shell configuration. The tabtab package, which the CLI uses for its completions, does not support adding these aliases automatically.

Our solution is to manually add the ntl alias to the tabtab-generated completion script once it is created.

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