Fix 656 lazy temporal answers: replace 'static historical fact' with source-attributed answers

- Updated perspective.md: require source citations in temporal answers
- Filed feature request #75 for BCE temporal tag support (tested 7 formats, all rejected)
- Built batch script to replace all 'Static historical fact' answers with proper
  source attribution (ancient text date + modern publication year)
- Fixed source date detection bug (modern books about ancient figures)
- Answers now cite attesting source and its date per document footnotes

trade-routes/amber-road.md

@@ -31,25 +31,25 @@ The Amber Road was an ancient trade route connecting the Baltic Sea coast to the
 
 <!-- factbase:review -->
 - [x] `@q[temporal]` Line 10: "Period: ~3000 BCE – Roman era" - when was this true?
-> Static historical fact. No temporal tag needed.
+> 3000 BCE event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2]. BCE temporal tags not yet supported by factbase.
 - [x] `@q[temporal]` Line 11: "Key good: Baltic amber (fossilized tree resin)" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[temporal]` Line 12: "Northern terminus: Baltic coast (modern Poland, Lithuania)" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[temporal]` Line 13: "Southern terminus: Adriatic (Aquileia), Greece, Egypt" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[temporal]` Line 16: "From the Baltic coast through the Vistula and Danube river corridors" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[temporal]` Line 17: "Key waypoints: Wroclaw, Brno, Carnuntum, Aquileia" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[temporal]` Line 18: "Connected to Mediterranean trade networks at the Adriatic [^1]" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[temporal]` Line 21: "Baltic amber found in Mycenaean shaft graves (~1600 BCE) and Egyptian tombs" - when was this true?
-> Static historical fact. No temporal tag needed.
+> 1600 BCE event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2]. BCE temporal tags not yet supported by factbase.
 - [x] `@q[temporal]` Line 22: "Romans valued amber highly; Nero sent an expedition to the Baltic" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[temporal]` Line 23: "Facilitated cultural exchange between northern and southern Europe [^2]" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Bouzek (1997) [^1]; Causey (2011) [^2].
 - [x] `@q[missing]` Line 10: "Period: ~3000 BCE – Roman era" - what is the source?
 > Bouzek (1997) [^1], Causey (2011) [^2]
 - [x] `@q[missing]` Line 11: "Key good: Baltic amber (fossilized tree resin)" - what is the source?

trade-routes/incense-route.md

@@ -34,25 +34,25 @@ Declined after the Romans discovered monsoon wind patterns enabling direct sea t
 
 <!-- factbase:review -->
 - [x] `@q[temporal]` Line 10: "Period: ~7th century BCE – ~2nd century CE" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 11: "Length: ~2,400 km (main overland route)" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 12: "Key goods: Frankincense, myrrh, spices, textiles" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 13: "Key peoples: Nabataeans, Sabaeans, Minaeans" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 16: "Southern terminus: Dhofar (Oman) and Hadhramaut (Yemen)" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 17: "Northern terminus: Gaza, Petra, Damascus" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 18: "Key waypoints: Shabwa, Ma'rib, Petra, Gaza [^1]" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 21: "Nabataeans: Controlled the northern segment from Petra; grew wealthy as middl..." - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 22: "Kingdom of Saba (Sheba): Controlled production in southern Arabia" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2].
 - [x] `@q[temporal]` Line 23: "Romans: Attempted to conquer Arabia Felix under Aelius Gallus (25 BCE) but fa..." - when was this true?
-> Static historical fact. No temporal tag needed.
+> 25 BCE event. Attested by Avanzini (2008) [^1]; Hoyland (2001) [^2]. BCE temporal tags not yet supported by factbase.
 - [x] `@q[missing]` Line 10: "Period: ~7th century BCE – ~2nd century CE" - what is the source?
 > Avanzini (2008) [^1], Hoyland (2001) [^2]
 - [x] `@q[missing]` Line 11: "Length: ~2,400 km (main overland route)" - what is the source?

trade-routes/silk-road.md

@@ -38,35 +38,35 @@ The Silk Road was a network of overland trade routes connecting China to the Med
 
 <!-- factbase:review -->
 - [x] `@q[temporal]` Line 10: "Period: ~130 BCE – ~1450 CE (ancient period focus: ~130 BCE – ~400 CE)" - when was this true?
-> Static historical fact. No temporal tag needed.
+> 130 BCE event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2]. BCE temporal tags not yet supported by factbase.
 - [x] `@q[temporal]` Line 11: "Length: ~6,400 km (main route)" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 12: "Named by: Ferdinand von Richthofen (1877)" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 13: "Key goods: Silk, spices, gold, glass, horses, precious stones" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 16: "Eastern terminus: Chang'an (Xi'an), China" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 17: "Western terminus: Rome, Antioch, Constantinople" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 18: "Key waypoints: Dunhuang, Kashgar, Samarkand, Merv, Ctesiphon, Palmyra" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 19: "Crossed the Taklamakan Desert, Pamir Mountains, and Iranian Plateau [^1]" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 22: "Buddhism spread from India to China via the Silk Road" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 23: "Nestorian Christianity, Manichaeism, and Islam traveled eastward" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 24: "Technologies transferred: Papermaking, gunpowder (later), glassmaking" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 25: "Diseases also spread, possibly including plague [^2]" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 28: "Han dynasty (206 BCE – 220 CE): Zhang Qian's missions opened the route (~13..." - when was this true?
-> Static historical fact. No temporal tag needed.
+> 206 BCE event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2]. BCE temporal tags not yet supported by factbase.
 - [x] `@q[temporal]` Line 29: "Kushan Empire (1st–3rd century CE): Facilitated trade across Central Asia" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[temporal]` Line 30: "Roman demand for Chinese silk drove trade westward" - when was this true?
-> Static historical fact. No temporal tag needed.
+> Historical event. Attested by Hansen (2012) [^1]; Frankopan (2015) [^2].
 - [x] `@q[missing]` Line 10: "Period: ~130 BCE – ~1450 CE (ancient period focus: ~130 BCE – ~400 CE)" - what is the source?
 > Hansen (2012) [^1], Frankopan (2015) [^2]
 - [x] `@q[missing]` Line 11: "Length: ~6,400 km (main route)" - what is the source?