docs: add sender verification spec (exploratory)#21
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Per-sender email verification using ANS principles: per-entity signing keys sealed into a SCITT transparency log, discoverable via DNS. Targets business email compromise where DKIM/SPF/DMARC pass but the sender is not who they claim. Includes data formats, mermaid diagrams, gateway verification path, BIMI integration, and Trust Index composition. Exploratory sketch, not an ANS protocol feature. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Adds SENDER_VERIFICATION_SPEC.md, an exploratory design for per-sender email verification using ANS principles. Updates README.md with a link under a new Exploratory section.
The design applies per-entity signing keys, a SCITT transparency log, and DNS discovery to email senders. It targets business email compromise where domain-level authentication passes but the sender is compromised or impersonated.
Not an ANS protocol feature. A standalone design sketch.
Test plan
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