re: CORRECTION -- the static assembler is not at fault, the pre-fix decoder was

Last iteration reported e303_wep_01 as inflated 30-110x by assemble_ship. Wrong:
the composite nodes carry scale 1.0 and orthonormal matrices, and under the
current decoder the turret places as 49x23x42 at +/-179. The 1600x2100x4800 box
only appears with XBG7_COVER_SLACK=4 -- the exact-coverage fix had already
repaired the turret too. The error came from comparing a deliberately pre-fix
render against post-fix measurements.

The containment screen's blindness therefore has a mundane cause: one mis-decode
inflated the envelope and hid another. Kept as a forward-looking invariant with
that caveat.

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

crates/sylpheed-formats/examples/node_scale.rs

@@ -0,0 +1,20 @@
+//! Dump a composite's scene nodes with their scale — the transform the static
+//! assembler copies verbatim into a placement.
+//! Usage: node_scale <container.xpr> <composite name>
+use sylpheed_formats::mesh::scene_world_nodes;
+fn main() {
+    let a: Vec<String> = std::env::args().collect();
+    let bytes = std::fs::read(&a[1]).expect("container");
+    for n in scene_world_nodes(&bytes, &a[2]) {
+        // Row norms of `m`: a rotation has all three at 1.0; anything else is a
+        // scale baked into the matrix, which `s` does not show.
+        let norm = |r: [f32; 3]| (r[0] * r[0] + r[1] * r[1] + r[2] * r[2]).sqrt();
+        println!(
+            "{:<26} s[{:7.3}{:7.3}{:7.3}]  |m rows|[{:7.3}{:7.3}{:7.3}]  t[{:9.1}{:9.1}{:9.1}]",
+            n.resource,
+            n.s[0], n.s[1], n.s[2],
+            norm(n.m[0]), norm(n.m[1]), norm(n.m[2]),
+            n.t[0], n.t[1], n.t[2]
+        );
+    }
+}