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/continuous-improve.log

@@ -2405,3 +2405,11 @@ To https://gitea.home.everyonce.com/daniel/factbase-ancient-history.git
 
 [?25h
 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
+[main 0217f0f] improve: Ancient Egypt
+ 2 files changed, 317 insertions(+)
+[2026-02-23 00:02:41] ✅ Committed: improve: Ancient Egypt
+[2026-02-23 00:02:41]   Done (154s) — UPDATED
+[2026-02-23 00:02:46] [10/66] Next up...
+[2026-02-23 00:02:46] ━━━ [Battle of Gaugamela] (2eca19) reviews=0 garbage=0 ━━━
+[2026-02-23 00:02:46]   🧹 Bash cleanup applied
+[2026-02-23 00:02:46]   🔍 Enrichment + review pass