Switch PR notification email from Outlook to Gmail SMTP

[Copilot]

Outlook SMTP AUTH (530 5.7.57) is not fixable via account settings on free Hotmail/Outlook.com accounts — POP/IMAP toggles only affect incoming mail. Switching to Gmail SMTP with an App Password resolves this permanently.

Changes

• pr-notification.yml: Replace Outlook SMTP with Gmail SMTP

# Before
server_address: "smtp-mail.outlook.com"
server_port: 587
username: "epschedule@hotmail.com"
password: ${{ secrets.MAIL_PASSWORD }}

# After
server_address: "smtp.gmail.com"
server_port: 465
secure: true
username: ${{ secrets.GMAIL_USER }}
password: ${{ secrets.GMAIL_APP_PASSWORD }}

Required secrets (repo admin)

Secret	Value
GMAIL_USER	Full Gmail address (e.g. epschedule@gmail.com)
GMAIL_APP_PASSWORD	16-char App Password — requires 2FA enabled on the account

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