Extend `inno export` with `--include-deleted` — export both live and delete-marked records

[ringo380]

Summary

Add --include-deleted flag to inno export that includes delete-marked records in the export output, using the undelete library.

CLI Design

inno export -f <file> --include-deleted                    # Include deleted records
inno export -f <file> --include-deleted --format csv       # CSV with _deleted column

Scope

• New flag on existing export subcommand
• Uses undelete library (Scan delete-marked records across all leaf pages — reconstruct full row data with timestamps #167) to find delete-marked records
• Adds _deleted boolean column and _trx_id column to output
• Works with all export formats (CSV, JSON, hex)

Depends on

#167 (scan delete-marked records)

Standalone

Not part of any epic.