fix: markdown report underlines and duplicate DNS record values

The plain-text-to-Markdown transform only recognized '-' underlines, but
batchText writes '=' — under the document title and as a 48-character
separator between reports. Both leaked through as literal bullets, so a
generated report opened with:

  # Scheduled Watchlist Report
  - ==========================

Title underlines are now consumed alongside the title, '=' underlines
promote to H2 the same as '-', and standalone divider runs render as a
Markdown horizontal rule.

Separately, the DNS section concatenated apex and wildcard records
without dedup. On a domain with wildcard DNS resolving to the same
addresses as the apex, every value was listed twice. Now deduped while
preserving order, so a wildcard value that genuinely differs is still
shown.

0 files changed, 0 insertions, 0 deletions