Stub reader-magnet welcome course, active: false pending Cate's story

Placeholder welcome-email copy in Cate's voice (Fantasy Michigan), wired
end-to-end but not enrollable until the real manuscript/cover/epub land.

courses/reader-magnet/day-0.md

@@ -0,0 +1,20 @@
+---
+subject: "Here's your story: [STORY TITLE]"
+redirect_url: "https://downloads.cateconners.com/reader-magnet/story.epub"
+---
+
+Thank you for finding your way here.
+
+I write Fantasy Michigan — old-growth woods, lakes that keep their own
+secrets, and the kind of magic that feels like it's always been
+half-visible at the edge of the Upper Peninsula, if you knew where to
+look. [STORY TITLE] is a short story set in that world, and I wanted you
+to have it first.
+
+Click below and it'll download straight to your device.
+
+[Get my story]({{.CTALink}})
+
+Enjoy the ride,
+
+Cate