fix(content): PR #133 review — 9 remaining items resolved

Closes 9 of 10 review items (blocker 1 handled in add2507e + d78d3b59):

- decisions/economics.md: reformat D-189 §5 amendment to standard
  Amendment (YYYY-MM-DD) block pattern (review #4)
- tooling/planet-gen/sol_name_fixes.py: dedup guard + argparse
  --dry-run (reviews #5, #10a)
- tooling/planet-gen/sol_markers/earth_features.json: trim to 11
  cities with selection rationale (review #6A); user-approved
  rebalance Sydney → Lagos and London → Brussels (review #6B)
- wiki/star-systems/GJ-380/bodies/GJ380c/markers.json: 2 secondary
  features renamed to Akan/Asante register — Kesset → Nkwanta Beck,
  Holt Spur → Bosomtwe Spur (review #7)
- docs/atlas/hand-refine-log.md: Aethelred lore-migration
  documentation + see-also cross-link to refine_log_849.md
  (reviews #8, #13)
- tooling/planet-gen/refine_log_849.md: rebalance addendum
- wiki/star-systems/GJ-0/bodies/GJ0d/markers.json, server/data/
  systems.db: re-synced after rebalance

Stub depth (review blocker #2) handled via split — tracked as
follow-up ticket #861 (three-layer narrative authoring).

Final Earth cities (11): Beijing, Brussels, Cairo, Delhi, Istanbul,
Lagos, Moscow, New York, São Paulo, Singapore, Tokyo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

wiki/star-systems/GJ-0/bodies/GJ0d/markers.json

@@ -48,7 +48,7 @@
     },
     {
       "id": "river_1",
-      "name": "Dnieper",
+      "name": null,
       "path": [
         [
           59,
@@ -266,7 +266,7 @@
     },
     {
       "id": "river_4",
-      "name": "Tone River",
+      "name": null,
       "path": [
         [
           87,
@@ -742,7 +742,7 @@
     },
     {
       "id": "river_10",
-      "name": "Cagayan",
+      "name": null,
       "path": [
         [
           102,
@@ -810,7 +810,7 @@
   "oceans": [
     {
       "id": "water_1",
-      "name": "The World Ocean",
+      "name": null,
       "kind": "ocean",
       "center": [
         125,
@@ -837,13 +837,13 @@
   "roads": [],
   "cities": [
     {
-      "id": "city_london",
-      "name": "London",
+      "id": "city_brussels",
+      "name": "Brussels",
       "center": [
-        79,
-        260
+        80,
+        266
       ],
-      "population": 9000000
+      "population": 2100000
     },
     {
       "id": "city_istanbul",
@@ -927,13 +927,13 @@
       "population": 5900000
     },
     {
-      "id": "city_sydney",
-      "name": "Sydney",
+      "id": "city_lagos",
+      "name": "Lagos",
       "center": [
-        161,
-        421
+        119,
+        263
       ],
-      "population": 5300000
+      "population": 15000000
     }
   ],
   "railroads": [],

wiki/star-systems/GJ-380/bodies/GJ380c/markers.json

@@ -52,7 +52,7 @@
     },
     {
       "id": "river_1",
-      "name": "The Kesset",
+      "name": "Nkwanta Beck",
       "path": [
         [
           250,
@@ -253,7 +253,7 @@
     },
     {
       "id": "range_5",
-      "name": "Holt Spur",
+      "name": "Bosomtwe Spur",
       "center": [
         33,
         396