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

civilizations/mycenaean-civilization.md

@@ -4,24 +4,24 @@
 # Mycenaean Civilization
 
 ## Overview
-The Mycenaean civilization (~1600–1100 BCE) was the first major civilization on mainland Greece, known for its warrior culture, palatial centers, and connection to the Homeric epics.
+The Mycenaean civilization (~1600–1100 BCE) was the first major civilization on mainland Greece, known for its warrior culture, palatial centers, and connection to the Homeric epics. @t[1600 BCE..1100 BCE]
 
 ## Key Facts
-- Region: Mainland Greece, Crete (after ~1450 BCE), Aegean islands
-- Period: ~1600–1100 BCE
+- Region: Mainland Greece, Crete (after ~1450 BCE), Aegean islands @t[~1450 BCE]
+- Period: ~1600–1100 BCE @t[1600 BCE..1100 BCE]
 - Major sites: Mycenae, Tiryns, Pylos, Thebes, Athens
 - Writing: Linear B (deciphered by Michael Ventris in 1952 as early Greek) [^1]
 - Society: Warrior aristocracy ruled by *wanax* (king)
 
 ## Achievements
 - Massive fortifications with Cyclopean masonry
-- Lion Gate at Mycenae (~1250 BCE)
+- Lion Gate at Mycenae (~1250 BCE) @t[~1250 BCE]
 - Tholos tombs (Treasury of Atreus)
 - Extensive trade networks reaching Egypt, the Levant, and Italy
 - Likely historical basis for the Trojan War tradition [^2]
 
 ## Decline
-Collapsed ~1100 BCE during the Bronze Age Collapse, leading to the Greek Dark Ages (~1100–800 BCE). Causes debated: Sea Peoples, internal conflict, systems collapse.
+Collapsed ~1100 BCE during the Bronze Age Collapse, leading to the Greek Dark Ages (~1100–800 BCE). Causes debated: Sea Peoples, internal conflict, systems collapse. @t[1100 BCE..800 BCE]
 
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 [^1]: Chadwick, J. *The Decipherment of Linear B* (Cambridge, 1958)