Grow the CosmOS disk to 512K, because it has to hold its own source

cosmos.img was 256 blocks and two directory blocks: 64K, sixteen files.
Ample for a disk that held nothing but programs, and not enough for the
thing that comes next. The native assembler reads SOURCE from this disk,
and the CosmOS sources alone are 104,142 bytes against the 65,536 a 256
block disk holds - so the machine could not hold its own source code.

2048 blocks and four directory blocks: 512K and room for 32 files.

Nothing was recorded that had to change, which is worth saying rather
than assuming: dir lists names and does not report free space, so no
golden file names a block count.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW

Programs/makefile

@@ -76,7 +76,7 @@ cosmos: $(COSMOS) $(APPS)
 $(COSMOS_DISK): $(APPS)
 	@mkdir -p $(@D)
 	rm -f $@
-	$(DISKTOOL) format $@ 256 2
+	$(DISKTOOL) format $@ 2048 4
 	@for app in $(APPS); do $(DISKTOOL) put $@ $$app; done
 
 # The system as well as the disk. Building only the image leaves whatever cosmos.bin was