Bookshelf walls

Note: Size: 2 m long (X, a whole number of metres on the 1 m grid), 2.4 m tall and 0.34 m deep as a carcass; about 0.94 m deep including the rolling ladder's foot. Origin: the snapping end, which is the left end seen from the front (x = 0), at the back face (z = 0, so the piece sits flush against a room wall), at floor level. The run spans x = 0 to x = length, the books face +Z and the model rests on y = 0. The plinth, cornice and brass rail run flush to both ends and nothing crosses x = 0 or x = length, so pieces butt into one continuous wall; each piece has its own end uprights, so a joint shows a double upright. There is one bay per grid metre. The back is a plain dark mahogany panel meant to face a wall. The GLB has 2,644 triangles in 23 meshes, is static and carries no animation clip; three-check's 2,934-triangle figure also counts the viewer's staging ground, which is not exported. Every material is named exactly after a kit palette colour, and the GLB lists names more than once because the exporter clones materials per mesh. Params are baked into the GLB at their defaults and only change the model when the scene is rebuilt in the viewer. bookColours (the kit's 'Book colours') sets the share of spines drawn from the bright kit colours (greens, parchment, warm white, brass, mid grey) instead of leather tones: 0 gives all leather browns and black, 1 gives about 60 % bright. The book layout comes from a fixed seed, so it is deterministic. length (1–4 m) rebuilds the run. shelves sets 4–7 book levels, bookFill thins each row, and ladder toggles the rolling ladder. Book meshes are named per colour (books.<colour>), so which ones exist depends on bookColours. The max extreme (4 m, 7 shelves, fill 1, colours 1) passed three-check at 6,332 triangles, and the min extreme (1 m, 4 shelves, fill 0.4, colours 0) passed at 812, both inside the 10,000 budget. Upright books are open boxes with no bottom or back face, which are never visible against the shelf and back panel. glb-lint: 0 errors and 6 heuristic warnings, covering material count and exporter duplicates, non-indexed geometry (deliberate flat shading), overlapping sibling boxes (shelves between uprights), the rail reported as detached (its brackets touch the uprights' front edge), and a 2.4 m height against the direction's 1 m reference. Its verdict reads UNVERIFIED only because no host requirements contract was supplied. plan-check rejects only the hyphenated library part ids, because its regex allows no hyphen; the same plan with the slug de-hyphenated passes. three-check and the GLB reload keep all 10 planned ids. Fix round 1 loosened the hero framing so the ladder wheels clear the bottom edge, and made bookColours 0 give pure leather tones.