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

treaties/peace-of-nicias.md

@@ -4,12 +4,12 @@
 # Peace of Nicias
 
 ## Overview
-The Peace of Nicias (421 BCE) was a treaty intended to end the first phase of the Peloponnesian War (the Archidamian War) between Athens and Sparta. It was supposed to last 50 years but effectively collapsed within a few years.
+The Peace of Nicias (421 BCE) was a treaty intended to end the first phase of the Peloponnesian War (the Archidamian War) between Athens and Sparta. It was supposed to last 50 years but effectively collapsed within a few years. @t[=421 BCE]
 
 ## Key Facts
-- Date: 421 BCE
+- Date: 421 BCE @t[=421 BCE]
 - Parties: Athens and Sparta (and their respective allies)
-- Context: Ended the Archidamian War (431–421 BCE), first phase of the Peloponnesian War
+- Context: Ended the Archidamian War (431–421 BCE), first phase of the Peloponnesian War @t[431 BCE..421 BCE]
 - Duration: Nominally 50 years; effectively ~6 years
 
 ## Terms
@@ -21,7 +21,7 @@ The Peace of Nicias (421 BCE) was a treaty intended to end the first phase of th
 - Key Spartan allies (Corinth, Boeotia) refused to sign
 - Neither side fully implemented the terms
 - Alcibiades undermined the peace by forming an anti-Spartan alliance
-- The Sicilian Expedition (415–413 BCE) effectively ended any pretense of peace [^2]
+- The Sicilian Expedition (415–413 BCE) effectively ended any pretense of peace @t[415 BCE..413 BCE] [^2]
 
 ---
 [^1]: Thucydides, *History of the Peloponnesian War* 5.18–19

treaties/treaty-of-apamea.md

@@ -4,12 +4,12 @@
 # Treaty of Apamea
 
 ## Overview
-The Treaty of Apamea (188 BCE) was imposed by Rome on the Seleucid Empire after the Roman-Seleucid War, effectively ending Seleucid power in Anatolia and establishing Roman dominance in the eastern Mediterranean.
+The Treaty of Apamea (188 BCE) was imposed by Rome on the Seleucid Empire after the Roman-Seleucid War, effectively ending Seleucid power in Anatolia and establishing Roman dominance in the eastern Mediterranean. @t[=188 BCE]
 
 ## Key Facts
-- Date: 188 BCE
+- Date: 188 BCE @t[=188 BCE]
 - Parties: Roman Republic and Seleucid Empire (Antiochus III)
-- Context: Followed the Battle of Magnesia (190 BCE)
+- Context: Followed the Battle of Magnesia (190 BCE) @t[=190 BCE]
 
 ## Terms
 - Seleucids withdrew from all territory west of the Taurus Mountains

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