docs(email): point the specs at the canonical module paths

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.

scripts/odysseus-mail

@@ -2,7 +2,7 @@
 """odysseus-mail — Unix-style command-line wrapper around the email
 backend that powers the web UI.
 
-Calls the same helpers `routes/email_helpers.py` exports, so a request
+Calls the same helpers `routes/email/email_helpers.py` exports, so a request
 issued from the shell hits IMAP/SMTP through the same connection pool
 and the same parsing pipeline as the HTTP routes. State is shared via
 `data/app.db` and `data/.app_key` (passwords decrypt automatically).

specs/email-contacts.md

@@ -8,7 +8,8 @@ This spec covers mail and contacts in:
 
 - app wiring in `app.py`;
 - `core.database.EmailAccount`;
-- `routes/email_routes.py`, `routes/email_helpers.py`, and `routes/email_pollers.py`;
+- canonical `routes/email/email_routes.py`, `routes/email/email_helpers.py`, and
+  `routes/email/email_pollers.py`, plus their shims at the old flat paths;
 - email threading in `src/email_thread_parser.py`;
 - email MCP tools in `mcp_servers/email_server.py`;
 - canonical contact/CardDAV routes in `routes/contacts/contacts_routes.py`,

specs/persistence.md

@@ -16,7 +16,7 @@ This spec covers durable state in:
 - `src/attachment_refs.py`, `src/upload_handler.py`, and
   `routes/upload_routes.py` for durable upload references and retention;
 - JSON stores managed by `core/auth.py`, `src/settings.py`, `src/api_key_manager.py`, `src/preset_manager.py`, `src/integrations.py`, `src/upload_handler.py`, `src/personal_docs.py`, `src/research_handler.py`, `src/bg_jobs.py`, `routes/prefs_routes.py`, canonical `routes/contacts/contacts_routes.py` and `routes/vault/vault_routes.py` plus their shims, `routes/cookbook_routes.py`, and memory/skills managers;
-- `routes/email_helpers.py` scheduled-email storage;
+- canonical `routes/email/email_helpers.py` scheduled-email storage;
 - `routes/backup_routes.py` and `scripts/odysseus-backup`;
 - runtime data under `data/`.
 
@@ -61,7 +61,7 @@ Email default-account state is serialized per owner. Startup normalizes legacy d
 
 `core/models.py` owns pure dataclasses used by `SessionManager`. It does not own database persistence.
 
-`routes/email_helpers.py` owns a second SQLite database at `data/scheduled_emails.db` for scheduled email, summary, reply, tag, sender-signature, urgency-alert, calendar-extraction, and cache state. Its migrations and owner backfills are local to that module, not `core/database.py`, and those auxiliary tables are owner-scoped.
+`routes/email/email_helpers.py` owns a second SQLite database at `data/scheduled_emails.db` for scheduled email, summary, reply, tag, sender-signature, urgency-alert, calendar-extraction, and cache state. Its migrations and owner backfills are local to that module, not `core/database.py`, and those auxiliary tables are owner-scoped.
 
 ## Migration Policy