Battle of Gaugamela: fix duplicate title, enrich with Iranica/Badian scholarship

- Remove duplicate # heading
- Add astronomical diary confirmation of date (Sachs & Hunger 1988)
- Clarify location uncertainty (Jomel River east of Mosul)
- Add Mazaeus as Persian right commander; surrendered Babylon, appointed satrap
- Add lunar eclipse omen (20 September)
- Add Persian sarissae detail (Diodorus 17.53.1)
- Clarify ancient troop numbers are unreliable per modern scholarship
- Add Persepolis capture date (January 330 BCE)
- Add [^3] Encyclopaedia Iranica / Bosworth as new reference
- Remove answered review queue (applied manually)

.automate/improve-history.log

@@ -49,3 +49,6 @@
 [2026-02-23T00:00:01+00:00] 229f8a | Mycenaean Civilization
   status: UPDATED | Mycenaean Civilization | changes: Fixed duplicate H1 title; removed stale review queue section (apply_review_answers returned 0 applied despite 20 answered questions — bug filed as Vikunja #88); corrected Region temporal tag from @t[~1450 BCE] to @t[1600 BCE..1100 BCE]; expanded Major sites list; added palace economy detail to Society; enriched Achievements with Cyclopean wall dimensions, shaft graves/Grave Circle A, Megaron as temple precursor; added new Religion and Culture section; added [^3] citation (Cartwright/World History Encyclopedia 2019) for all new facts
   duration: 69s
+[2026-02-23T00:02:41+00:00] 2ac383 | Ancient Egypt
+  status: UPDATED | Ancient Egypt | changes: fixed duplicate heading; added First Intermediate Period, Second Intermediate Period, Third Intermediate Period, Late Period to Major Periods with temporal tags; added Narmer Palette to Achievements; added Shaw (2000) as [^2] source; filed Vikunja bug #89 for MCP transport closed error
+  duration: 154s