Say "boot image" where that is what is meant

"Binary" was doing three jobs. It meant an SPBT file that the machine starts
from; it meant whatever the assembler happened to produce, which is now
either that or a loadable program; and it meant a compiled host tool. A word
that means three things means none of them, and the first of the three has a
name already - this project has been calling them boot images for a while
and the manuals had not caught up.

  Where it means an SPBT file       -> boot image
  Where it means either output      -> output
  Where it means a host executable  -> left alone
  Where it means base two           -> left alone

The user facing messages move with it:

  Error: No boot image specified.
  Usage: ./SplitBit [OPTIONS] <boot image>
  Error: This is not a SplitBit boot image.
  Error: This boot image is in format version 2, and this emulator reads 1.
  Successfully wrote SplitBit boot image to "hello.bin".

The assembler's own help was the interesting case. Its -o writes either
format, so "the binary" there was never right - it is "the output" now, and
the message that names the format is the one that says which it wrote.

No recorded output contained the word, so nothing needed re-blessing.
Checked before starting rather than after.

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

Programs/CosmOS/Assembler/Asm.asm

@@ -6,7 +6,8 @@
 ; Loading and running are separate commands in this shell, so the file to assemble is the
 ; argument to run rather than a second name after the program's.
 ;
-; Reads assembly source off the disk and writes a binary back to it, with no host involved
+; Reads assembly source off the disk and writes a boot image or a loadable program back to it,
+; with no host involved
 ; anywhere. The output has to be byte for byte what the C assembler produces from the same
 ; source, which is the only honest test of it and the one the suite runs.
 ;
@@ -2046,7 +2047,7 @@ ImgHold:
 DropWalk:
   0x00 0x00
 
-; How big a binary this can build. Everything the assembler makes has to fit here at once,
+; How big an output file this can build. Everything the assembler makes has to fit here at once,
 ; because a file is written in one call and there is nowhere to put half of one. CosmOS
 ; itself comes to 9,564 bytes.
 ImgRoom:
@@ -2152,7 +2153,7 @@ BasesText:
 at zero, on top of whatever is there. Give both a #Base, or neither.
 "
 TooBigText:
-"the binary would be bigger than this assembler has room to build
+"the output would be bigger than this assembler has room to build
 "
 NoWriteText:
 "it would not write "