Release v0.1.0-preview.28: transactional account email

Reviewed source export adds verified TLS mail, encrypted outbox, mailbox verification and password reset protocols. Preserve public ancestry; omit local development history and operational queue. Consumer deployment and inbox delivery proof remain separate.

scripts/public-snapshot.allow

@@ -42,6 +42,11 @@ authhttp/authhttp.go
 authhttp/authhttp_test.go
 authhttp/passkey.go
 authhttp/passkey_test.go
+authmail/authmail.go
+authmail/authmail_test.go
+authmail/README.md
+authsqlite/mail.go
+authsqlite/mail_test.go
 authsqlite/store.go
 authsqlite/store_test.go
 authsqlite/directory.go
@@ -63,6 +68,7 @@ authsqlite/passkey.go
 authsqlite/passkey_test.go
 authsqlite/recovery.go
 authwebauthn/fuzz_test.go
+authwebauthn/algorithm_test.go
 authwebauthn/service.go
 authwebauthn/service_test.go
 authwebauthn/types.go
@@ -76,6 +82,13 @@ cmssqlite/associations.go
 cmssqlite/store_test.go
 cmssqlite/example_test.go
 media/media.go
+mail/mail.go
+mail/smtp.go
+mail/mail_test.go
+mail/README.md
+mailsqlite/queue.go
+mailsqlite/queue_test.go
+mailsqlite/README.md
 media/media_test.go
 medialocal/store.go
 medialocal/store_test.go