Advanced Three.js WebXR Passthrough AR Implementation

Act as a Spatial Computing Architect. Develop a highly complex, production-ready WebXR Augmented Reality (AR) experience natively utilizing Three.js. You must programmatically initiate an AR session requesting the 'hit-test' and 'light-estimation' features. Write the exact render loop logic required to cast an invisible mathematical ray from the physical device camera against the real-world [HIT_TEST_SURFACE] (e.g., a living room floor). Once a plane is detected, spawn the highly detailed [AR_OBJECT_MODEL] at those exact coordinates. Crucially, detail the API integration for [LIGHTING_ESTIMATION]—dynamically generating a Three.js `DirectionalLight` and `EnvironmentMap` that perfectly mimics the actual physical lighting of the user's room to completely destroy the uncanny valley and ground the 3D model in reality.