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

technologies/bronze-working.md

@@ -4,19 +4,19 @@
 # Bronze Working
 
 ## Overview
-Bronze working — the alloying of copper with tin — defined the Bronze Age (~3300–1200 BCE) and enabled advances in weaponry, tools, and art across Eurasia.
+Bronze working — the alloying of copper with tin — defined the Bronze Age (~3300–1200 BCE) and enabled advances in weaponry, tools, and art across Eurasia. @t[3300 BCE..1200 BCE]
 
 ## Key Facts
-- Period: ~3300–1200 BCE (Bronze Age)
+- Period: ~3300–1200 BCE (Bronze Age) @t[3300 BCE..1200 BCE]
 - Composition: ~88% copper, ~12% tin
-- Earliest bronze: Mesopotamia and the Caucasus, ~3300 BCE
+- Earliest bronze: Mesopotamia and the Caucasus, ~3300 BCE @t[~3300 BCE]
 - Spread to: Egypt, Indus Valley, China, Europe
 
 ## Development
 - Copper smelting preceded bronze by ~2,000 years (Chalcolithic period)
 - Tin was scarce; long-distance trade networks developed to source it (Cornwall, Afghanistan, Southeast Asia) [^1]
 - Lost-wax casting technique enabled complex shapes
-- Chinese bronze casting (Shang dynasty, ~1600 BCE) achieved exceptional sophistication [^2]
+- Chinese bronze casting (Shang dynasty, ~1600 BCE) achieved exceptional sophistication @t[~1600 BCE] [^2]
 
 ## Impact
 - Superior weapons: Swords, spearheads, armor