feat: launch NEXUS TERMINAL — Bloomberg-style FX options analytics platform

Full-stack forex options analytics terminal with Bloomberg-inspired UI.

Backend (FastAPI + Python):
- Garman-Kohlhagen options pricing engine with full Greeks
- Goldman Sachs gs-quant AI signals (RSI, MACD, Bollinger, Hurst, OU)
- Monte Carlo GBM simulation and volatility surface generation
- CFTC COT institutional positioning + Forex Factory economic calendar
- Live data proxy: OpenSky aircraft + USGS earthquakes (CORS-safe)
- Multi-leg strategy library (straddle, iron condor, butterfly, spreads)

Frontend (React 18 + Vite):
- NEXUS animated orbital logo (3-ring SVG) + canvas favicon animation
- Bloomberg terminal design: JetBrains Mono, color-mix() tokens
- 11 dashboard tabs: Greeks, Chart, AI Signals, 3D Surfaces, Breakeven,
  Scenarios, Monte Carlo, Institutional, Calendar, Live Map, Live Feeds
- Live World Map (react-leaflet): aircraft, earthquakes, weather radar
- Live Feeds: CoinGecko crypto top-12 + Windy.com global webcams
- Economic calendar with filters + institutional flow (CFTC COT)
- Animated landing page + session-based routing
- Fully responsive dark-only terminal design system

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/python-check.yml

@@ -0,0 +1,49 @@
+name: Python Check
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+
+      - name: Install dependencies
+        run: pip install -r requirements.txt
+
+      - name: Verify script executes without error
+        # Use a non-interactive matplotlib backend so plots don't open a window
+        env:
+          MPLBACKEND: Agg
+        run: |
+          cd src
+          python -c "
+          import sys, os
+          sys.path.insert(0, os.path.abspath('.'))
+          from config import *
+          from greeks import portfolio_greeks
+          from surface import risk_surface, pnl_surface
+          import numpy as np
+
+          S_range = np.linspace(SPOT_LOW, SPOT_HIGH, 10)
+          sigma_range = np.linspace(VOL_LOW, VOL_HIGH, 10)
+          D, G, V, Th = risk_surface(EXAMPLE_PORTFOLIO, S_range, sigma_range, DEFAULT_TIME_TO_EXPIRY, DEFAULT_RISK_FREE_RATE)
+          P = pnl_surface(EXAMPLE_PORTFOLIO, S_range, sigma_range, DEFAULT_TIME_TO_EXPIRY, DEFAULT_RISK_FREE_RATE, DEFAULT_SPOT, DEFAULT_VOLATILITY)
+          assert D.shape == (10, 10), 'Delta surface shape mismatch'
+          assert G.shape == (10, 10), 'Gamma surface shape mismatch'
+          assert V.shape == (10, 10), 'Vega surface shape mismatch'
+          assert Th.shape == (10, 10), 'Theta surface shape mismatch'
+          assert P.shape == (10, 10), 'PnL surface shape mismatch'
+          print('All checks passed.')
+          "