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

civilizations/ancient-greece.md

@@ -4,30 +4,30 @@
 # Ancient Greece
 
 ## Overview
-Ancient Greece (~800–146 BCE) comprised independent city-states (*poleis*) that produced foundational contributions to Western philosophy, democracy, science, art, and literature.
+Ancient Greece (~800–146 BCE) comprised independent city-states (*poleis*) that produced foundational contributions to Western philosophy, democracy, science, art, and literature. @t[800 BCE..146 BCE]
 
 ## Key Facts
 - Region: Greek peninsula, Aegean islands, western Anatolia, colonies across the Mediterranean
-- Period: ~800 BCE (Archaic) – 146 BCE (Roman conquest)
+- Period: ~800 BCE (Archaic) – 146 BCE (Roman conquest) @t[~800 BCE]
 - Major city-states: Athens, Sparta, Corinth, Thebes
 - Language: Ancient Greek (Indo-European)
-- Writing: Greek alphabet, adapted from Phoenician ~800 BCE
+- Writing: Greek alphabet, adapted from Phoenician ~800 BCE @t[~800 BCE]
 
 ## Major Periods
-- Archaic (~800–480 BCE): Colonization, rise of the polis, early philosophy
-- Classical (480–323 BCE): Golden Age of Athens, Peloponnesian War, Alexander
-- Hellenistic (323–146 BCE): Post-Alexander kingdoms, cultural diffusion
+- Archaic (~800–480 BCE): Colonization, rise of the polis, early philosophy @t[800 BCE..480 BCE]
+- Classical (480–323 BCE): Golden Age of Athens, Peloponnesian War, Alexander @t[480 BCE..323 BCE]
+- Hellenistic (323–146 BCE): Post-Alexander kingdoms, cultural diffusion @t[323 BCE..146 BCE]
 
 ## Achievements
-- Athenian democracy established ~508 BCE under Cleisthenes [^1]
+- Athenian democracy established ~508 BCE under Cleisthenes @t[~508 BCE] [^1]
 - Philosophy: Socrates, Plato, Aristotle
 - Drama: Aeschylus, Sophocles, Euripides, Aristophanes
 - History: Herodotus, Thucydides
-- Olympic Games, first held 776 BCE
-- Parthenon completed ~432 BCE
+- Olympic Games, first held 776 BCE @t[=776 BCE]
+- Parthenon completed ~432 BCE @t[~432 BCE]
 
 ## Decline
-Greece fell under Macedonian hegemony after the Battle of Chaeronea (338 BCE), then became a Roman province after the destruction of Corinth in 146 BCE.
+Greece fell under Macedonian hegemony after the Battle of Chaeronea (338 BCE), then became a Roman province after the destruction of Corinth in 146 BCE. @t[=338 BCE]
 
 ---
 [^1]: Ober, J. *The Rise and Fall of Classical Greece* (Princeton, 2015)