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

.automate/improve-history.log

@@ -22,3 +22,6 @@
 [2026-02-22T22:40:41+00:00] 072273 | Greek Religion
   status: UPDATED | Greek Religion | changes: Fixed duplicate title; corrected Apollo's domain from "Sun" to "Light, music, prophecy, healing" (Helios was the sun god); expanded Overview with no-creed/no-priestly-class note; enriched Religious Practices with libations and votive offerings; added five new sections: Sanctuary Structure (temenos/naos), Hero Cults, Household Religion, Polis Religion (Sourvinou-Inwood/Kindt framework), expanded Delphi oracle with De Boer & Hale 2001 geological ethylene theory, expanded Eleusinian Mysteries with kykeon/ergot scholarship; added three new footnotes (Eidinow & Kindt 2015, De Boer et al. 2001, Arkeonews 2024)
   duration: 88s
+[2026-02-22T22:41:40+00:00] 07edd5 | Treaty of Kadesh
+  status: UPDATED | Treaty of Kadesh | changes: Fixed duplicate H1 title; added "Physical Record" section covering original silver tablets (now lost), Hugo Winckler's 1906 discovery at Hattusa, and current location of Hittite tablets at the Ancient Orient Museum in Istanbul; added divine witnesses/curses clause to Terms; noted the informal nature of the treaty name (Kadesh not mentioned in text); added scholarly date variant (1258 BCE); noted post-treaty peace period enabling Ramesses II's building projects; added [^3] Wikipedia citation for new facts
+  duration: 52s