final comment sweep: section separators, signature-only javadocs and history notes removed, stale comments corrected (sign/contents model lookup, inverted entity cubes, item-bounds use, datapack folder search, biome tint argb, water-only overlay faces, beacon first section, mushroom-cow instanceof example, legacy skin arm copy, elytra and pack-detection notes in the scripts, pptest scene descriptions), comments only

tools/build-vanilla-pack.sh

@@ -2,8 +2,8 @@
 # Builds the runtime resource pack PixelPics renders from (blockstates, models, textures, items,
 # atlases, font) straight from Mojang's CLIENT jar — no launcher install needed. The plugin ships no
 # assets itself; drop the resulting zip into plugins/PixelPics/resourcepack/. Run it once per
-# Minecraft update. No pack.mcmeta needed (the client jar has none; the loader detects the pack by
-# its assets/minecraft/blockstates folder).
+# Minecraft update. No pack.mcmeta needed (the client jar has none; the loader detects a zip by its
+# vanilla blockstate files).
 #
 # Needs: curl, jq, unzip, zip.
 #