Add BCE temporal tags to all documents; add temporal-dating steering doc

treaties/treaty-of-kadesh.md

@@ -2,12 +2,12 @@
 # Treaty of Kadesh
 
 ## Overview
-The Treaty of Kadesh (~1259 BCE) between Egypt and the Hittite Empire is the earliest known international peace treaty. It ended decades of conflict between the two great Bronze Age powers. The name "Treaty of Kadesh" is informal — the treaty text itself does not mention the Battle of Kadesh.
+The Treaty of Kadesh (~1259 BCE) between Egypt and the Hittite Empire is the earliest known international peace treaty. It ended decades of conflict between the two great Bronze Age powers. The name "Treaty of Kadesh" is informal — the treaty text itself does not mention the Battle of Kadesh. @t[~1259 BCE]
 
 ## Key Facts
-- Date: ~1259 BCE (some scholars cite 1258 BCE)
+- Date: ~1259 BCE (some scholars cite 1258 BCE) @t[~1259 BCE]
 - Parties: Egypt (Ramesses II) and Hittite Empire (Hattusili III)
-- Context: Followed the Battle of Kadesh (~1274 BCE), approximately 15 years later
+- Context: Followed the Battle of Kadesh (~1274 BCE), approximately 15 years later @t[~1274 BCE]
 - Languages: Egyptian hieroglyphic and Akkadian cuneiform
 - Original medium: Silver tablets (now lost); surviving versions are copies