test(custom-comments): cover the eight interactive comment wrappers

The internal `cj/--comment-*` helpers were covered in the sibling test files; their interactive wrappers were the gap. 11 new tests drive each wrapper through its full prompt cycle (read-string / read-from-minibuffer / completing-read all stubbed) and assert the wrapper produces output containing the supplied text. The length-option branches for `cj/comment-simple-divider` are exercised across all three values (fill-column / half-column / match-text), and `cj/comment-hyphen`'s thin delegate to `cj/comment-inline-border` with "-" is covered too.

The wrappers split between `read-string` and `read-from-minibuffer` for their text input (box uses minibuffer; the rest use read-string); the tests stub each function explicitly to drive the right path.

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