fix(atlas): add ice hydrosphere to outer frozen bodies in GJ 105A

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

docs/atlas/proposals/GJ105A.json

@@ -166,7 +166,7 @@
       "rotation_period_hours": 36.0,
       "atmosphere": "trace",
       "biome_summary": "frozen",
-      "hydrosphere": null,
+      "hydrosphere": "ice",
       "economic_role": null,
       "settlement_pattern": null,
       "industrial_corridor": null,
@@ -186,7 +186,7 @@
       "rotation_period_hours": 44.0,
       "atmosphere": "trace",
       "biome_summary": "frozen",
-      "hydrosphere": null,
+      "hydrosphere": "ice",
       "economic_role": null,
       "settlement_pattern": null,
       "industrial_corridor": null,
@@ -206,7 +206,7 @@
       "rotation_period_hours": 56.0,
       "atmosphere": "none",
       "biome_summary": "frozen",
-      "hydrosphere": null,
+      "hydrosphere": "ice",
       "economic_role": null,
       "settlement_pattern": null,
       "industrial_corridor": null,