Implements find_path() using A* over triangle adjacency with XZ heuristic.
Path starts at the given start point, passes through intermediate triangle
centers, and ends at the goal point. Returns None when points are outside
the mesh or no connection exists. 5 passing tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Introduces the voltex_ai crate with NavMesh, NavTriangle structs and
XZ-plane barycentric point-in-triangle helper. Includes find_triangle,
triangle_center, and edge_midpoint utilities with 4 passing tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
