TracerModule

A tracer record: one march algorithm as engine-compatible YAML.

In the namespace shader. Declared in src/libs/libshader/shader/TracerModule.hpp.

Detailed description

Same idiom as sdf/primitives/<id>.yaml — metadata, declared parameters, and a self-contained shaderCode snippet — so that a module benched here can be inlined by the engine unchanged (§RQ-6). engineAlgorithmId records which slot of the engine's legacy raymarchAlgorithm switch this module reproduces, for the §RQ-IM-8 parity matrix and the scene-file migration.