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

definitions/ancient-history-terms.md

@@ -7,15 +7,15 @@
 - **BCE**: Before Common Era — equivalent to BC, used in secular academic contexts
 - **CE**: Common Era — equivalent to AD, used in secular academic contexts
 - **Bronze Age**: Period characterized by bronze metallurgy (~3300–1200 BCE in the Near East)
-- **Iron Age**: Period following the Bronze Age, characterized by iron technology (~1200–~500 BCE)
-- **Archaic Period**: Early phase of Greek civilization (~800–480 BCE)
-- **Classical Period**: Height of Greek civilization (~480–323 BCE)
-- **Hellenistic Period**: Post-Alexander era of Greek cultural diffusion (323–30 BCE)
+- **Iron Age**: Period following the Bronze Age, characterized by iron technology (~1200–~500 BCE) @t[~500 BCE]
+- **Archaic Period**: Early phase of Greek civilization (~800–480 BCE) @t[800 BCE..480 BCE]
+- **Classical Period**: Height of Greek civilization (~480–323 BCE) @t[480 BCE..323 BCE]
+- **Hellenistic Period**: Post-Alexander era of Greek cultural diffusion (323–30 BCE) @t[323 BCE..30 BCE]
 
 ## Political Terms
 - **Polis**: Greek city-state, the fundamental political unit of ancient Greece
 - **Satrapy**: Provincial administrative unit of the Persian Empire, governed by a satrap
-- **Principate**: First phase of the Roman Empire (27 BCE–284 CE), maintaining republican facades
+- **Principate**: First phase of the Roman Empire (27 BCE–284 CE), maintaining republican facades @t[=27 BCE]
 - **Dominate**: Later phase of the Roman Empire (284–476 CE), openly autocratic
 - **Foederati**: Barbarian groups settled within the Roman Empire under treaty obligations