Add wind tunnel simulation and interactive CLI for aircraft design - #22

Adds aerodynamic simulation and CLI tooling for aircraft design experimentation. Existing GUI receives minimal enhancements (wind tunnel integration buttons).

Implementation

Wind Tunnel Engine (wind_tunnel.py)

• Lift/drag coefficient calculations using thin airfoil theory with Prandtl finite wing corrections
• Stall modeling, trim finding (binary search), stability analysis (static margin)
• Angle of attack sweeps (-5° to 20°), pressure distribution

CLI Tool (aircraft_designer_cli.py)

• Interactive mode: guided parameter input
• Quick mode: python aircraft_designer_cli.py -w 1000 -c 150 --weight 1000
• Batch mode: JSON input/output for automation

GUI Integration (airframe_designer.py)

• Wind tunnel button added to Fixed Wing and Glider designers (+78 lines)
• Opens simulation window with real-time AoA sweep tables and recommendations
• Results export to JSON

Testing (test_wind_tunnel.py)

• 10 unit tests covering aerodynamic calculations
• Validation against NACA data (±10% stall speed, ±15% L/D)

Usage

# Interactive design session
python aircraft_designer_cli.py -i

# Quick analysis
python aircraft_designer_cli.py -w 1200 -c 180 --weight 1400 --cruise 15

# Batch processing
python aircraft_designer_cli.py --batch design.json -o results.json

Design file format:

{
  "design_params": {
    "wingspan": 1200,
    "chord": 180,
    "weight": 1400,
    "airfoil_type": "clark_y"
  },
  "cruise_speed": 15.0
}

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