Write a WooCommerce out-of-stock waitlist notification email

Write the back-in-stock notification email for a WooCommerce store:

PRODUCT: [Ridgeline Trail Runner, men's size 10.5]
WAITLIST SIZE: [340 people signed up for a restock alert on this size]
RESTOCK QUANTITY: [only 45 units arrived in this restock, not enough to cover the
waitlist]
PATTERN: [this size has historically sold out again within about 2 hours of a restock
notification going out]

Write the email and the sending plan:

1. The email copy itself: confirm the specific size is back, state honestly that
   quantity is limited given the size of the waitlist relative to the restock, and give
   a direct link straight to that size's add-to-cart, not the general product page,
   since every extra click between the email and checkout costs conversions in a
   restock this tight.
2. Judgment call on send strategy: since 340 people are waiting for only 45 units,
   blasting the entire list at once guarantees roughly 295 people click a "back in
   stock" email and land on a sold-out page within minutes, which reads as worse than
   no notification at all. Instead, plan a staggered or randomized-batch send (for
   example, notify in batches of 50, spaced 20-30 minutes apart) or a short reserved
   window for the first respondents, so the experience for at least some of the list is
   "I got the email and it worked," rather than the whole list getting "I got the email
   and it was already gone."
3. A one-line note for whoever misses out in this restock: keep them on the waitlist
   automatically for the next restock rather than removing them after one unsuccessful
   notification, and say so in the email, since silently dropping people after one miss
   just produces repeat waitlist signups from the same customers.
4. A short subject line option that states urgency honestly (based on the real
   historical 2-hour sellout pattern) without inventing a countdown or fake stock
   counter that isn't backed by this restock's real numbers.

Replace the bracketed product, waitlist size, and restock quantity with your own.