B6: Ship model rendering #144

Summary

Render a Bridge Commander ship model using the NIF parser, scene graph, and bgfx renderer. This is the first visual milestone: a stock BC ship displayed on screen.

Requirements

• Load a ship NIF via the V3.1 parser
• Build scene graph from NIF hierarchy
• Load and bind TGA textures
• Apply material properties (diffuse, specular, emissive)
• Render with the Standard shader (lit, alpha blend, z-read+write)
• Camera controls (orbit around ship)

Verification

Compare rendered output with NifSkope visualization for at least 3 stock ships (e.g., Galaxy, Sovereign, Klingon BOP).

Acceptance Criteria

• Ship renders correctly with textures
• Multiple ship models load and display
• Camera orbit works
• Visual comparison with NifSkope is close match

Depends on: #141 (NIF), #142 (scene graph), #143 (asset resolver), #140 (bgfx)
Blocks: #120