find_by_email gated on AppUsersRead via `require`, which short-circuits
when cx.principal == None. An anonymous public-HTTP script could
iterate emails to enumerate registered users, then pivot to login or
request_password_reset.
Tighten: explicitly return Forbidden when cx.principal is None — scripts
that need a "does this email exist" probe from a public route must
wrap the call in their own auth gate.
AUDIT.md anchor: F-S-003.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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