- _markdown_to_signal docstring claimed SPOILER support but the regex list
never handled ``||...||``. Correct the docstring to match the four
actually-supported styles (BOLD / ITALIC / STRIKETHROUGH / MONOSPACE).
Signal's SPOILER bodyRange would need dedicated ``||spoiler||`` parsing
and is left for a follow-up.
- scripts/release.py: add exiao's noreply email to AUTHOR_MAP so the
contributor-attribution gate accepts their cherry-picked commit.