re: the consistency figure is mostly composite bounding boxes -- real disagreement is 1

consensus_check names the minority container instead of just flagging
disagreement: 89 minority decodes across 477 resources with a majority, and 88
are scene composites. A composite's descriptor carries a 24-vertex bounding box
(e_rou_e106 -> 22x22x22, e_rou_f106 -> 745x718x718); those boxes look
interchangeable so the assignment shuffles per container. 1141 of 6209 decoded
resources have scene nodes. Counting only real geometry the disc has ONE
disagreement: e101_wep_01_l in Stage_S25.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

crates/sylpheed-formats/examples/composite_geometry.rs

@@ -0,0 +1,34 @@
+//! How much of the "decoded geometry" belongs to SCENE COMPOSITES rather than to
+//! real meshes? A composite (`rou_*`, `e_rou_*`) carries node transforms; the
+//! anchor scan nevertheless finds a block for it, and that pseudo-geometry lands
+//! in coverage and consistency counts.
+//! Usage: composite_geometry <resource3d_dir>
+use sylpheed_formats::mesh::{scene_world_nodes, Xbg7Model};
+fn main() {
+    let dir = std::env::args().nth(1).expect("resource3d dir");
+    let mut files: Vec<_> = std::fs::read_dir(&dir)
+        .unwrap()
+        .flatten()
+        .map(|e| e.path())
+        .filter(|p| p.extension().and_then(|s| s.to_str()) == Some("xpr"))
+        .collect();
+    files.sort();
+    let (mut total, mut composite, mut composite_named) = (0usize, 0usize, 0usize);
+    for f in &files {
+        let Ok(bytes) = std::fs::read(f) else { continue };
+        for m in Xbg7Model::anchor_models_cancellable(&bytes, 0.0, &|| false) {
+            total += 1;
+            let has_nodes = !scene_world_nodes(&bytes, &m.name).is_empty();
+            let named = m.name.starts_with("rou_") || m.name.starts_with("e_rou_");
+            if has_nodes {
+                composite += 1;
+            }
+            if named {
+                composite_named += 1;
+            }
+        }
+    }
+    println!(
+        "{total} decoded; {composite} have scene nodes (a composite), {composite_named} are named rou_/e_rou_"
+    );
+}