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assets/railings/README.md

@@ -54,6 +54,11 @@ Two things to know:
   to -0.041), and its `frame` part's mesh is not centred on its own part origin
   either. Placement works from the measured frame in `srfp/railings/parts.py`,
   never from an assumed centred pivot.
+- **`railing_4` is also the only kit with anything above its post.** Its `frame`
+  cap runs from z 0.873 to 0.914; its post stops at 0.873. Kits 1-3 have
+  full-height posts (post top *is* the kit height) with every rail and baluster
+  strictly below. That is why it alone needs a corner cap square — see the
+  2026-08-12 amendment to ADR-0034.
 
 `railing_1`'s texture is `SubUSDs/textures/railling_1_post_diffuse.jpg.jpg` —
 the doubled extension is the vendor's, and the USD references it by that exact