fix: improve mbox patch parser resilience for optional tag fallback

- Use mailparse crate to handle RFC 2047 encoded-words (Q/B encoding)
  and RFC 2822 header folding in Subject and From headers
- Fix email signature separator check: use exact match 'line == "-- "'
  instead of starts_with to avoid false positives on body lines
- Remove dead/incorrect asctime parsing in committer date extraction;
  simplify to always return None (falls back to author_timestamp)

0 files changed, 0 insertions, 0 deletions