DKIM2

[juliebin]

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Note

Low Risk
Documentation-only changes with no runtime or auth logic; main review risk is accuracy of API names, internal links, and nav anchor paths.

Overview
Adds a new DKIM2 documentation set for Momentum 4, placed alongside the existing DKIM1 articles.

The overview (content/momentum/4/dkim2.md) explains DKIM2 vs DKIM1, dkim2 {} enablement, Lua policy hooks (validate_data_spool_each_rcpt), key reuse, coexistence with DKIM1/ARC, and a long known limitations section (draft spec risk, lower-hop crypto, DSN, forwarders, BCC/rt=, recipes, AR strings, CRLF config).

Child reference pages cover msys.validate.dkim2.sign(), verify(), ar_clauses(), and debug_level / paniclog behavior, with option tables, forwarder/nd= bridge and recipe signing, verify result/reason codes, SMTP guidance, and AR examples.

Navigation (content/momentum/navigation.yml) adds a DKIM2 section under Momentum 4 with links to signing and verifying topics.

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Doug taking ownership of PR.