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- 9.1: allocate shared Depth32Float depth texture + view in Renderer, sized to the initial surface (create_depth_texture helper, reusable for the Phase 4.4 resize); Renderer::new now takes width/height. - 9.2: attach depth_stencil_attachment (clear 1.0 / store) to both the low-level render and high-level render_scene passes. - 9.3: every pipeline declares a matching DepthStencilState (write true, compare Less) via the shared DEPTH_FORMAT constant (D1). Décisions D1-D4 actées 2026-09-18 (DRAFT Étape 9).