The move left three documents naming `routes/email_routes.py`,
`routes/email_helpers.py` and `routes/email_pollers.py` as where the
code is. The shims keep those import paths working, so nothing breaks —
but each of those files is now seventeen lines that redirect, and a
reader sent there finds no email code at all.
Follows the phrasing specs/persistence.md already uses for the
contacts and vault subpackages: name the canonical path and note the
shims.
Léo
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