docs: drop process labels and refresh the architecture and manual pages

Assisted-by: GLM 5.3

docs/CLI.md

@@ -260,7 +260,7 @@ Usage: gasm debug <file.s> --func <name>
 | `-buf` | empty | buffer spec: `name:size:pattern[,name:size:pattern]` (zero, ones, seq or hex) |
 | `-args` | empty | file containing the ABI0 argument block |
 | `-script` | empty | run REPL commands from a file, one per line, and exit; `-` reads stdin |
-| `-timeout` | 0 | kill the debuggee after this duration, for headless `-script` runs |
+| `-timeout` | 0 | kill the debuggee after this duration, for headless `-script` runs; a timeout exits 3 |
 | `-cover` | off | run to completion with a breakpoint on every instruction and report which executed |
 
 The debugger spawns the debuggee from the `gasm` binary on `$PATH`, so install
@@ -447,6 +447,7 @@ version control.
 | `0` | success |
 | `1` | a failure the program detected: a parse or assembly error, an error-severity lint diagnostic, a mismatch in `verify`, a file that cannot be read |
 | `2` | the arguments were wrong: a missing or extra argument, an unknown command or format, an invalid `--map` pair |
+| `3` | `debug --timeout` killed the debuggee |
 
 ## Examples