Ask for the disk space the build really needs, and say how long an install really takes.

The launcher asked for 31 GB where the build's own check now asks for about 34, so a disk between the two passed the first check and was refused seconds later. Both say 34 GB now. The build no longer asks for the whole shader preparation's space when the game folder already holds translations. The texts said 10 to 25 minutes for an install that took players 27 to 41, and 5 GB for a build cache that measures 1.6. A build error's message goes into the launcher's log as one line.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

docs/README-BuildKit.md

@@ -13,7 +13,7 @@ downloads included, and keeps the game up to date. This page is the same build b
   NVIDIA).
 - Your own dump of the game as a `.nup` file (or its `exefs` and `romfs` folders), with the 1.1.1 update: program
   `0400486024DEC000`, main build `e0f3ccfa`. Other versions are refused.
-- About 30 GB free on the disk you build to, besides the dump.
+- About 34 GB free on the disk you build to, besides the dump.
 
 ## One-time setup (about 15 minutes)
 
@@ -58,7 +58,7 @@ last draws the Xbox, PlayStation, Steam Deck and keyboard and mouse button promp
 meanwhile. If it stops, run the same command again: finished steps are skipped.
 
 When it says `finished`, start `C:\Games\Ocarina\ocarina.exe`. You can delete `C:\Games\Ocarina\build-cache` (about
-5 GB) afterwards.
+1.5 GB) afterwards.
 
 ## Linux