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>

docs/atlas/hand-refine-log.md

@@ -116,7 +116,7 @@ River and ocean collisions (Rio Grande ×23 rivers, Steinbruch ×19 rivers, Ridg
 - `city_0` "Iron Creek" → "Kallast" (matches tier1.toml `kallast_agrosyndic` settlement; critical consistency fix)
 - `city_1` "Willow Bend" → "Rán's Landing" (references the Norse sea goddess and system name)
 - `river_0` "Flatland Stream" → "Rán's Run" (Norse/system reference)
-- `river_1` "Gap Crossing" → "Aldren Pass" (invented Nordic-Anglo compound)
+- `river_1` "Gap Crossing" → "Aldren Pass" (invented Nordic-Anglo compound; subsequently renamed "Randalfoss" in a later fix pass to eliminate the cross-system Aldren stem collision with GJ380c)
 - `river_2` "Ridge Fork" → "Scarp Fork" (less generic geological term)
 - `river_3` "Pine Gulch" → "Timber Keld" (Old Norse: keld = cold spring)
 - `river_4` "Valley View" → "Ranfall Beck" (system reference + Nordic 'beck' for stream)