Two edits applied by Wesche so the as-shipped thinking-on file runs (index.html = untouched output, repaired/index.html = edited):

1. Line 492: a garbled duplicate of the pagoda wall ring call — `putRing(V.solid,PAG_X,PAG_W?0:0+w===0?0:0,PAG_Z,...)` — referencing an undefined `PAG_W`, sitting directly above the correct call on line 494. Deleted. Without it addPagoda throws and the world is empty.
2. Lines 754-755: the hover handler calls `getMatrixAt(sel.id, m4)` but `m4` is a const local to buildMeshes; renamed to the module-scope `_m4`. Without it the first pointer move over the scene throws and the render loop stops.

Receipt numbers (tokens, wall time, tok/s) are unchanged by the repair. The thinking-off file needed no edits.