Default to America/Phoenix and email-alert once when the session expires

Phoenix doesn't observe DST, so schedule times stay meaningful
year-round without needing a seasonal adjustment.

notify.py reuses lunch-notifier's existing Gmail-SMTP-with-app-password
pattern rather than adding a new notification channel. The alert fires
exactly once per expiry (not on every failed scheduled run while it's
down) via a dedupe flag in notify_state.json, reset the moment a fresh
session is successfully imported.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H6TgffxTvYhqxykAbVQg2v

notify.py

@@ -0,0 +1,34 @@
+"""Email alerts via Gmail SMTP + app password — the same pattern already
+used by lunch-notifier on this box, reused here rather than adding a new
+notification service. Silently a no-op if GMAIL_USER/GMAIL_APP_PASSWORD
+aren't set, so the alert feature is opt-in.
+"""
+import logging
+import os
+import smtplib
+from email.mime.text import MIMEText
+
+logger = logging.getLogger("massprice.notify")
+
+GMAIL_USER = os.environ.get("GMAIL_USER")
+GMAIL_APP_PASSWORD = os.environ.get("GMAIL_APP_PASSWORD")
+ALERT_EMAIL = os.environ.get("ALERT_EMAIL") or GMAIL_USER
+
+
+def send_alert(subject, body):
+    """Best-effort: logs and returns False on any failure rather than
+    raising, since a broken alert channel shouldn't break automation."""
+    if not GMAIL_USER or not GMAIL_APP_PASSWORD or not ALERT_EMAIL:
+        return False
+    msg = MIMEText(body)
+    msg["Subject"] = subject
+    msg["From"] = GMAIL_USER
+    msg["To"] = ALERT_EMAIL
+    try:
+        with smtplib.SMTP_SSL("smtp.gmail.com", 465) as server:
+            server.login(GMAIL_USER, GMAIL_APP_PASSWORD)
+            server.sendmail(GMAIL_USER, [ALERT_EMAIL], msg.as_string())
+        return True
+    except Exception:
+        logger.exception("Failed to send alert email")
+        return False