0.2.5-dev: official scenes merge chunks that share a material / lightmap into one mesh at load (draw calls on the 3D board back within budget, e.g. act2autochess_m02 prep 22 → 13); the boss-round real-server test reads the actual random pairing instead of assuming the host on the left half; golden: unchanged

docs/history/0.2.5.md

@@ -391,7 +391,9 @@ lightmap pages with the baked shadow mask in alpha, albedo textures) to `public/
 `.cache/official-scenes/*`; `tools/local-extract/fetch_scenes.py` downloads the in-season bundles from the official
 CDN (md5-checked against that version's hot-update list). The 3D board draws a stage's scene when the local-art
 manifest lists it (`board3d/load.js loadScenePack`, `scene.js setScenePack`); the procedural metal board stays the
-fallback and still draws the devices, gates, field edges and terrain overlays.
+fallback and still draws the devices, gates, field edges and terrain overlays. Chunks of the parts on screen that
+share a material and a lightmap page are one mesh (`mergeSceneChunks`), so a battlefield such as act2 m02 (36 chunks,
+5 lightmap pages) stays inside the board's draw-call budget. A switched-off HIDDEN part is left out of that mesh.
 
 Owner decision (2026-10-12): the eleven scenes belong to the 0.2.5 asset pack. The maintainer's full release zip
 includes the extracted files. A lite package or a source install may download and extract them on that machine