docs(cookbooks): add Loops welcome email integration

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Description

Adds a Loops integration section to the Welcome Email cookbook. The existing local example remains unchanged and runnable without an external email provider; the new section shows how to replace the placeholder print / console.log email send with a Loops transactional email API call for production delivery.

The Loops example uses direct HTTP calls, so no new SDK dependency is required. It also demonstrates Idempotency-Key handling so Hatchet retries can avoid duplicate email sends.

Type of change

• Documentation change (pure documentation change)

What's Changed

• Add a Loops section to the Welcome Email cookbook
• Show Python and TypeScript examples for sending Loops transactional emails
• Document required Loops setup: account, verified sending domain, transactional email, transactionalId, and LOOPS_API_KEY
• Include idempotency-key handling for retry-safe email sends
• Keep the original local print / console.log example unchanged

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Project	Deployment	Actions	Updated (UTC)
hatchet-docs	Ready	Preview, Comment	May 5, 2026 7:59pm