fix(content): PR #133 round 2 review — 3 remaining Miri items

- tooling/planet-gen/earth_blocklist.txt: document GJ0d (Earth body) as
  blocklist-exempt so Brussels (and other Earth-canonical city names) are
  not flagged on next sol_import.py run (R2 issue 1)
- wiki/star-systems/GJ-380/bodies/GJ380c/markers.json: rename Selet Basin
  → Subin Basin (Kumasi river namesake). Brings Akan register on GJ380c
  to 3/29 features distributed across river, mountain, lake — credible
  multi-generational trade corridor read instead of minimum-viable patch
  (R2 issue 2)
- server/data/systems.db: atlas_oceans resynced for GJ380c
- docs/atlas/hand-refine-log.md:119: corrected stale log entry — Aldren
  Pass was subsequently renamed Randalfoss to eliminate the cross-system
  Aldren stem collision with GJ380c (R2 nit 3)
- tooling/planet-gen/refine_log_849.md: Groombridge cross-corridor
  addendum updated to reflect 3/29 Akan register distribution

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

tooling/planet-gen/earth_blocklist.txt

@@ -57,6 +57,7 @@ Vienna
 Prague
 Warsaw
 Amsterdam
+# GJ0d (Earth body) is exempt — this blocklist applies to alien worlds only, not to Earth itself.
 Brussels
 Copenhagen
 Stockholm

tooling/planet-gen/refine_log_849.md

@@ -183,9 +183,10 @@ in their established Anglo register:
 |---|---|---|---|
 | river | The Kesset | Nkwanta Beck | Nkwanta = Akan "junction/crossroads" — trade-route name; Beck suffix localizes it |
 | mountain | Holt Spur | Bosomtwe Spur | Bosomtwe = sacred Asante lake in Ghana; Spur suffix preserved from Groombridge convention |
+| lake | Selet Basin | Subin Basin | Subin = river running through Kumasi itself — distributes Akan signal across a third feature type |
 
 **Corridors are tendencies, not borders** — capital and primary geography stay Anglo-British;
-peripheral features reflect Kumasi trade influence. DB re-synced.
+peripheral features reflect Kumasi trade influence. 3/29 features now carry Akan register (river, mountain, lake). DB re-synced.
 
 ---