data(atlas): name unnamed stations and inhabited belt

Morwenna Station (GJ166A), Havelmark (GJ251), Portela (GJ699),
Grindvik belt and Sturen Platforms (GJ820B). Names chosen to match
each system's cultural heritage and naming register.

All 85 verifiable proposals now pass atlas-verify.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/atlas/proposals/GJ166A.json

@@ -216,7 +216,7 @@
   "stations": [
     {
       "station_id": "GJ166Ac-S1",
-      "proper_name": null,
+      "proper_name": "Morwenna Station",
       "orbits_body_id": "GJ166Ac",
       "station_type": "research",
       "population": 2000,

docs/atlas/proposals/GJ251.json

@@ -276,7 +276,7 @@
   "stations": [
     {
       "station_id": "GJ251c-S1",
-      "proper_name": null,
+      "proper_name": "Havelmark",
       "orbits_body_id": "GJ251c",
       "station_type": "industrial",
       "population": 120000000,

docs/atlas/proposals/GJ699.json

@@ -236,7 +236,7 @@
   "stations": [
     {
       "station_id": "GJ699b-S1",
-      "proper_name": null,
+      "proper_name": "Portela",
       "orbits_body_id": "GJ699b",
       "station_type": "transit",
       "population": 100000000,

docs/atlas/proposals/GJ820B.json

@@ -74,7 +74,7 @@
     },
     {
       "body_id": "GJ820B-belt",
-      "proper_name": null,
+      "proper_name": "Grindvik",
       "body_type": "asteroid_belt",
       "orbit_index": 4,
       "parent_body_id": null,
@@ -307,7 +307,7 @@
     },
     {
       "station_id": "GJ820Bc-S2",
-      "proper_name": null,
+      "proper_name": "Sturen Platforms",
       "orbits_body_id": "GJ820Bc",
       "station_type": "industrial",
       "population": 300000000,