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Refactor received header parsing: replace regex list with RFC 5321 to… (#150)

* Refactor received header parsing: replace regex list with RFC 5321 tokenizer

Replace the 10 separate regex patterns (each duplicating boundary
lookaheads) with a keyword-based tokenizer aligned with RFC 5321 §4.4
grammar. Key improvements:

- Tokenize on clause keywords (from/by/via/with/id/for) in a single
  pass instead of running 10 independent regex searches
- Handle IBM "for <addr> from <sender>" by accepting only the first
  'from' clause per header
- Extract envelope-from/sender from parenthesized comments in clause
  values
- Validate IPv4 octets (0-255) instead of matching any digits; add
  IPv6 support via REGXIP6
- Simplify JUNK_PATTERN to only collapse tabs/newlines, preserving
  parenthesized comments and bracketed IPs
- Add 27-test corpus covering Postfix, Exim, Exchange, Gmail,
  SendGrid, IBM/Domino, AWS SES, and edge cases

https://claude.ai/code/session_01CwmwWkvZGLpTBY6ApKFi79

* Refactor markdown linting configuration and improve MailParser error handling

* Enhance date parsing and logging in MailParser; add tests for envelope-from handling

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Co-authored-by: Claude <noreply@anthropic.com>

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