contract: mirror email (0x0B05, IAM); remove the Mail domain from #1417

[AdaWorldAPI]

What

A follow-up to #1417, paired with AdaWorldAPI/OGAR#325.

• ogar_codebook gets one row, ("email", 0x0B05), right after auth_ory_keto. OGIT source: ogit:Email.
• The 0x05XX rows from contract: mirror the Mail domain (0x05XX: mailbox, mail_message) #1417 (mailbox, mail_message) and the ConceptDomain::Mail route are removed. 0x0500 routes to Unassigned again.

Why

#1417 mirrored a new Mail domain with two concepts that had no OGIT source. That was a lockstep central mint, which the hot-plug pattern rules out. OGAR now mints the OGIT entity ogit:Email in the existing IAM domain, and the mirror follows it so that a plug of email binds without MirrorDrift.

Nothing consumes the removed rows or the Mail variant. ConceptDomain is #[non_exhaustive].

Verification

• cargo test -p lance-graph-contract --lib ogar_codebook passes, including 0x0500 → Unassigned and canonical_concept_id("email") == Some(0x0B05).
• lance-graph-ogar codebook parity passes against the OGAR branch.
• Guide check: deleting the email row still builds and fails mirror_is_a_faithful_copy_of_ogar_codebook.

Merge order

Merge together with OGAR #325. Spear #6 goes after.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T20:01:55.214189Z	678f834	Draft marked ready

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