Fix draft essay frontmatter: set public false and exposure draft

Author: cursoragent

writings/one-hour-with-managed-agents.md

@@ -5,9 +5,9 @@ subtitle: "From announcement to autonomous PR — and what it revealed about epi
 slug: one-hour-with-managed-agents
 author: "Klappy"
 type: essay
-public: true
+public: false
 audience: public
-exposure: public
+exposure: draft
 tier: 1
 voice: first_person
 stability: draft