v0.7.1

• State only the violation in a slug error message and move the remedy into each surface's own diagnostic, so a caller holding a command line is told to pass --fallback-verbatim or a different --delimiter instead of to reach for a Rust enum variant it has no way to type
• Emit slug errors with an AFDATA hint field naming the flag to reach for, matching the message/hint split the rest of the CLI already follows