Write a Product Update Email for Customers

Write a product update email for existing customers:

Product name: [PRODUCT]
Audience segment: [WHO GETS THIS]
What shipped: [FEATURES OR FIXES]
Why it matters to them: [CUSTOMER OUTCOME]
Tone: [TONE]
Primary CTA: [CTA]
Secondary link (docs / changelog): [URL PLACEHOLDER]
Known limitations or follow-ups: [NOTES]

Requirements:
1. Lead with the customer outcome, not the release number.
2. Keep the body scannable with short paragraphs and optional bullets.
3. Include one clear CTA and one optional secondary link.
4. Mention limitations honestly without sounding defensive.
5. Subject line under 50 characters when possible; preview text that adds new info.

Deliverables:
1. Subject line + preview text (3 options ranked).
2. Full email body ready for an ESP.
3. A one-sentence in-app toast version of the same update.