Sync mailbox transition conflict contract

[roshanjonah]

Summary

• document mailbox transition conflicts in the generated management contract
• regenerate the matching mailbox collection without manual edits
• preserve the staged ordering after docs PR Document billing checkout recovery #28

Verification

• confidentiality check
• external links check
• JSON parse check
• generated Postman drift check
• git diff --check

Hosted collection synchronisation remains deferred until the matching runtime contract is live.

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