Create welcome letter email template for participants

[neerpatel]

Objective

Create a reusable welcome letter email template for Velocity GP participants.

Details

Produce email copy for the participant welcome message, including subject line options, greeting, event context, what to expect next, and clear call-to-action links/placeholders.

Checklist

• Provide 2-3 subject line variants
• Draft full email body copy with placeholders (event name, date, links, support contact)
• Include CTA language for next steps
• Include plain-text fallback version
• Submit template for product/ops review

Dependencies

Parent feature: #75

Notes

Template should support quick customization for different events without rewriting core copy.