Count blank lines, code lines, and comment lines separately

[MatthewMckee4]

Summary

Extend line counting to distinguish between blank lines, comment lines, and code lines. This gives users a more detailed picture of their codebase composition.

Example

kount --detailed .

  Code  Blank  Comment  File
──────  ─────  ───────  ─────────────────
   120     20       12  src/walker.rs
    70     10        7  src/counter.rs
──────  ─────  ───────  ─────────────────
   190     30       19  total (2 files)

Considerations

• Comment syntax varies by language — would need a comment definition table for common languages
• Could start with a small set (Rust, Python, JS/TS, Go, C/C++, Java) and expand over time
• --detailed flag enables this mode; default behavior remains total line count only

Acceptance criteria

• --detailed flag enables blank/code/comment breakdown
• Supports comment syntax for at least 5 common languages
• Falls back to total lines only for unrecognized extensions
• Works with all output formats (table, JSON, summary)