diskern scan prints duplicates but never the findings

[Muawiya-contact]

diskern scan <dir> prints the file count, the total, and the top 10 duplicate sets — and that's it. report.findings is only ever used for its .len().

So the part of the report that says what a file is and why it's safe, which is the whole point of the rules engine, is invisible unless you pass --json and read it yourself.

Something like the app's grouping would do: findings by verdict, then by category, with the matched rule as the reason. Worth having a --top N or --verdict safe filter so it stays readable on a big scan.

crates/diskern-cli/src/main.rs:47