Improve documentation with cross-references and README enhancements

Co-authored-by: orange-cpp <59374393+orange-cpp@users.noreply.github.com>

docs/collision/line_tracer.md

@@ -168,4 +168,14 @@ public:
 
 ---
 
-*Last updated: 31 Oct 2025*
+## See Also
+
+- [Plane Documentation](../3d_primitives/plane.md) - Ray-plane intersection
+- [Box Documentation](../3d_primitives/box.md) - AABB collision detection
+- [Triangle Documentation](../linear_algebra/triangle.md) - Triangle primitives
+- [Tutorials - Collision Detection](../tutorials.md#tutorial-4-collision-detection) - Complete collision tutorial
+- [Getting Started Guide](../getting_started.md) - Quick start with OMath
+
+---
+
+*Last updated: 1 Nov 2025*

docs/engines/source_engine/camera_trait.md

@@ -105,5 +105,9 @@ This satisfies `CameraEngineConcept` expected by `projection::Camera` (look-at,
 
 ## See also
 
-* Source Engine math helpers in `omath/engines/source_engine/formulas.hpp` (view/projection builders used above).
-* Generic camera wrapper `omath::projection::Camera` and its `CameraEngineConcept` (this trait is designed to plug straight into it).
+* [Source Engine Formulas](formulas.md) - View/projection matrix builders
+* [Source Engine Constants](constants.md) - Engine-specific constants
+* [Source Engine Pred Engine Trait](pred_engine_trait.md) - Projectile prediction for Source Engine
+* [Generic Camera Documentation](../../projection/camera.md) - Camera base class
+* [Getting Started Guide](../../getting_started.md) - Quick start with OMath
+* [Tutorials - World-to-Screen](../../tutorials.md#tutorial-2-world-to-screen-projection) - Projection tutorial

docs/linear_algebra/vector2.md

@@ -288,4 +288,13 @@ static Vector2   from_im_vec2(const ImVec2&) noexcept;
 
 ---
 
-*Last updated: 31 Oct 2025*
+## See Also
+
+- [Vector3 Documentation](vector3.md) - 3D vector operations
+- [Vector4 Documentation](vector4.md) - 4D vector operations
+- [Getting Started Guide](../getting_started.md) - Quick start with OMath
+- [Tutorials](../tutorials.md) - Step-by-step examples
+
+---
+
+*Last updated: 1 Nov 2025*

docs/linear_algebra/vector3.md

@@ -294,4 +294,14 @@ bool is_perpendicular(const Vector3&) const noexcept;
 
 ---
 
-*Last updated: 31 Oct 2025*
+## See Also
+
+- [Vector2 Documentation](vector2.md) - 2D vector operations
+- [Vector4 Documentation](vector4.md) - 4D vector operations
+- [Angle Documentation](../trigonometry/angle.md) - Working with angles
+- [Getting Started Guide](../getting_started.md) - Quick start with OMath
+- [Tutorials](../tutorials.md) - Practical examples including vector math
+
+---
+
+*Last updated: 1 Nov 2025*

docs/projectile_prediction/projectile_engine.md

@@ -149,4 +149,14 @@ Return `nullopt` if `t*` is absent.
 
 ---
 
+## See Also
+
+- [Projectile Documentation](projectile.md) - Projectile properties
+- [Target Documentation](target.md) - Target state representation
+- [Legacy Implementation](proj_pred_engine_legacy.md) - Standard projectile prediction engine
+- [AVX2 Implementation](proj_pred_engine_avx2.md) - Optimized AVX2 engine
+- [Tutorials - Projectile Prediction](../tutorials.md#tutorial-3-projectile-prediction-aim-bot) - Complete aim-bot tutorial
+
+---
+
 *Last updated: 1 Nov 2025*

docs/projection/camera.md

@@ -258,4 +258,13 @@ struct LHCTrait {
 
 ---
 
+## See Also
+
+- [Engine-Specific Camera Traits](../engines/) - Camera implementations for different game engines
+- [View Angles Documentation](../trigonometry/view_angles.md) - Understanding pitch/yaw/roll
+- [Getting Started Guide](../getting_started.md) - Quick start with projection
+- [Tutorials - World-to-Screen](../tutorials.md#tutorial-2-world-to-screen-projection) - Complete projection tutorial
+
+---
+
 *Last updated: 1 Nov 2025*