Update email schema to use format-assertion

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: This PR updates the IETF email address schema to use the library’s JSON Schema 2020-12 format-assertion dialect so format: "email" is enforced during validation.
Changes:

• Switch $schema to the urn:sourcemeta:…:dialect:format-assertion dialect and remove the custom regex-based constraints.
• Refresh schema metadata (RFC link/title) and tweak the examples list.
• Update the email test corpus expectations to match asserted format behavior (e.g., comments/domain-literal/numeric TLD cases).

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

The title references RFC 5321 but also calls the syntax “Addr-Spec”, which is RFC 5322 terminology (RFC 5321 §4.1.2 describes a Mailbox/Local-part@Domain). Consider aligning the title/link/terminology to a single RFC to avoid misleading consumers about the intended grammar.

Severity: low

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