rename natus → sky across the codebase — natal chart abstraction is now sky throughout, since chart inputs aren't birthday-gated

Mechanical rename: 5 files (sky-wheel.js, _sky.scss, _sky_overlay.html, SkyWheelSpec.js x2), 24 in-place edits across templates/views/urls/SCSS/JS/tests/CLAUDE.md. URL names epic:natus_save → epic:sky_save (epic namespaced, no clash w. dashboard:sky_save), JS module NatusWheel → SkyWheel, DOM ids id_natus_* → id_sky_*, BEM classes natus-* → sky-*, dashboard sky_natus_data/sky_natus_preview collapsed to sky_data/sky_preview_data. No DB migration needed (User.sky_chart_data + GameEvent.SKY_SAVED already used sky-prefix). 778 ITs + Jasmine green.

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

src/apps/epic/views.py

@@ -975,10 +975,10 @@ def tarot_deal(request, room_id):
     })
 
 
-# ── Natus (natal chart) ───────────────────────────────────────────────────────
+# ── Sky (natal chart) ───────────────────────────────────────────────────────
 
 @login_required
-def natus_preview(request, room_id):
+def sky_preview(request, room_id):
     """Proxy GET to PySwiss /api/chart/ and augment with distinction counts.
 
     Query params:
@@ -1064,7 +1064,7 @@ def natus_preview(request, room_id):
 
 
 @login_required
-def natus_save(request, room_id):
+def sky_save(request, room_id):
     """Create or update the draft Character for the requesting gamer's seat.
 
     POST body (JSON):