`humanize_list` output is incorrect when list contains only one item

Metadata

Project: craft-cli
Number: #412
Type: issue
State: open
Author: lengau
Labels: Status: Triaged Type: Bug
Created: 2026-01-22 22:08:31+00:00
Updated: 2026-04-22 11:15:07+00:00
Closed: —

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Issue body

### Bug Description When `humanize_list` is run with only a single item, it returns an invalid value. ``` >>> craft_cli.utils.humanize_list(['1']) ', and 1' ``` ### To Reproduce ``` craft_cli.utils.humanize_list(['1']) ``` ### part yaml ```shell ``` ### Relevant log output ```shell n/a ```

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