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

technologies/iron-smelting.md

@@ -4,19 +4,19 @@
 # Iron Smelting
 
 ## Overview
-The development of iron smelting technology (~1200 BCE onward) ushered in the Iron Age, making metal tools and weapons accessible beyond elite classes and transforming agriculture, warfare, and society.
+The development of iron smelting technology (~1200 BCE onward) ushered in the Iron Age, making metal tools and weapons accessible beyond elite classes and transforming agriculture, warfare, and society. @t[~1200 BCE]
 
 ## Key Facts
-- Transition period: ~1200–800 BCE (varies by region)
-- Earliest iron smelting: Anatolia (Hittites), ~1500 BCE (limited use)
-- Widespread adoption: After the Bronze Age Collapse (~1200 BCE)
+- Transition period: ~1200–800 BCE (varies by region) @t[1200 BCE..800 BCE]
+- Earliest iron smelting: Anatolia (Hittites), ~1500 BCE (limited use) @t[~1500 BCE]
+- Widespread adoption: After the Bronze Age Collapse (~1200 BCE) @t[~1200 BCE]
 - Key innovation: Carburization (adding carbon to create steel)
 
 ## Development
 - Meteoric iron used before smelting was developed
 - Hittites may have been early innovators, though evidence is debated [^1]
 - Iron became widespread after the Bronze Age Collapse disrupted tin trade routes
-- Chinese independently developed cast iron by ~500 BCE (bloomery iron in the West until medieval period) [^2]
+- Chinese independently developed cast iron by ~500 BCE (bloomery iron in the West until medieval period) @t[~500 BCE] [^2]
 
 ## Impact
 - Democratized access to metal tools (iron ore is abundant, unlike tin)

technologies/roman-aqueducts.md

@@ -7,7 +7,7 @@
 Roman aqueducts were engineering marvels that transported water over long distances using gravity, supplying cities with fresh water for drinking, bathing, and sanitation. Rome alone had 11 aqueducts delivering ~1 million cubic meters daily.
 
 ## Key Facts
-- First Roman aqueduct: Aqua Appia (312 BCE)
+- First Roman aqueduct: Aqua Appia (312 BCE) @t[=312 BCE]
 - Total aqueducts serving Rome: 11 (by 226 CE)
 - Combined length: ~500 km (mostly underground)
 - Daily water delivery to Rome: ~1 million cubic meters [^1]
@@ -19,9 +19,9 @@ Roman aqueducts were engineering marvels that transported water over long distan
 - Settling tanks and distribution castella regulated flow
 
 ## Notable Aqueducts
-- Aqua Appia (312 BCE): First aqueduct, built by Appius Claudius Caecus
-- Aqua Marcia (144 BCE): Longest at ~91 km
-- Pont du Gard (France, ~19 BCE): Three-tiered bridge, 49 m high [^2]
+- Aqua Appia (312 BCE): First aqueduct, built by Appius Claudius Caecus @t[=312 BCE]
+- Aqua Marcia (144 BCE): Longest at ~91 km @t[=144 BCE]
+- Pont du Gard (France, ~19 BCE): Three-tiered bridge, 49 m high @t[~19 BCE] [^2]
 - Aqueduct of Segovia (Spain, ~1st century CE): Still standing
 
 ---

technologies/roman-roads.md

@@ -8,7 +8,7 @@ The Roman road network was one of the greatest engineering achievements of the a
 
 ## Key Facts
 - Total network: ~400,000 km (80,000 km paved)
-- First major road: Via Appia (312 BCE), Rome to Capua
+- First major road: Via Appia (312 BCE), Rome to Capua @t[=312 BCE]
 - Construction: Layered system of gravel, sand, and paving stones
 - Maintained by: State and local authorities
 
@@ -19,8 +19,8 @@ The Roman road network was one of the greatest engineering achievements of the a
 - Milestones (*miliaria*) every Roman mile (~1.48 km)
 
 ## Major Roads
-- Via Appia (312 BCE): "Queen of Roads," Rome to Brindisi
-- Via Egnatia (~146 BCE): Connected Adriatic to Byzantium
+- Via Appia (312 BCE): "Queen of Roads," Rome to Brindisi @t[=312 BCE]
+- Via Egnatia (~146 BCE): Connected Adriatic to Byzantium @t[~146 BCE]
 - Via Augusta: Spain
 - Stane Street, Watling Street: Roman Britain [^2]