Bug: CSV Headers Printed Repeatedly During Pagination

[jpoehnelt]

Pattern: Edge cases surrounding formatting logic interfacing with the CLI's pagination behavior.

Findings:
In formatter.rs::format_csv, the CSV headers are hardcoded to be printed at the top of the output string on every format execution:

let _ = writeln!(output, "{}", columns.join(","));

Because the executor.rs processes pages in loop batches when the --page-all flag is specified, format_csv gets called repeatedly. This results in the CSV header row being printed out multiple times in the middle of the document at every page boundary.

Recommendation: Pass a flag or context to output formatters indicating is_first_page, or extract the header rendering logic to a separate dedicated step for tabular outputs so it only writes once at the start of loop processing.

[jpoehnelt]

Fixed by #37