DKIM2

[juliebin]

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Note

Low Risk
Documentation-only changes with no application code; reviewers should spot-check internal links (e.g. the cited Known limitations anchor).

Overview
Adds Momentum 4.x operator documentation for prototype DKIM2 (content/momentum/4/dkim2.md): what it changes versus DKIM1, enabling the dkim2 {} module, Lua msys.validate.dkim2.sign / verify (including per-recipient hook requirements), forwarder/modifier recipes, verify result shapes, debugging/paniclog, and DKIM1 key reuse.

Navigation (content/momentum/navigation.yml) now lists Using DKIM2 under Configuring Momentum, with sub-entries for DKIM2 Signing and DKIM2 Verifying, placed after the existing DKIM pages.

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