Count all split material textures in the new GPU census

Co-Authored-By: Codex <[email protected]>

crates/horizon-client-render/src/gfx.rs

@@ -2084,7 +2084,9 @@ impl Renderer {
             ("block_sprites", textures(&self.sprite_textures)),
             (
                 "pbr_maps",
-                self.pbr_maps.as_ref().map_or(0, |maps| textures(maps)),
+                self.pbr_maps.as_ref().map_or(0, |maps| {
+                    maps.iter().flatten().map(texture_bytes).sum()
+                }),
             ),
             (
                 "flat_draws",

docs/research/terrain-material-inputs-20261103.json

@@ -598,6 +598,7 @@
     "integration": "Normal merge preserving both original material test module and new public-main rgb_alpha_tests module. No product conflict; current public main API compiled and checked separately.",
     "research": "No new external shader research; no memory/history or closed original implementation access.",
     "fixture_sha256": "cb0ed419d87449fca478b422a68cc4c5d7145ac7d285ae4bad3a3755c1352d3d",
-    "checks": "Pending; exact new-head results recorded in PR followup and own handoff. Prior-head results are historical."
+    "checks": "Pending; exact new-head results recorded in PR followup and own handoff. Prior-head results are historical.",
+    "integration_correction": "First current-main gate revealed E0308 in newly added gpu_census: sum bytes across all split normal/specular texture pairs instead of passing Vec<[Texture;2]> to former slice helper. No rendering/fixture behavior change. First failed gate retained at6833688."
   }
 }