docs: state the validation status and correct claims the material contradicts

Assisted-by: DeepSeek V4.1 Flash

docs/man/gasm-verify.1

@@ -45,7 +45,8 @@ a single function is invoked with user-supplied buffers
 .RB ( \-buf )
 instead of the smoke/abi/fuzz sweeps.  Useful for partial functions
 (e.g. decoders) that crash on random input but should succeed on valid
-data.
+data.  The function named must be NOSPLIT: a function with a stack frame
+is refused with a diagnostic and exits 1.
 .PP
 With
 .B \-save\-corpus
@@ -73,7 +74,7 @@ Buffer spec for -call: name:size:pattern[,name:size:pattern] where
 pattern is zero, ones, seq, or hex.
 .TP
 .B \-call \fIname\fR
-Call a single function with -buf instead of the sweeps.
+Call a single NOSPLIT function with -buf instead of the sweeps.
 .TP
 .B \-fuzz
 Differential fuzz: JIT both the gasm and the go-tool-asm versions and
@@ -107,8 +108,8 @@ a file that cannot be assembled exits 1 and a usage error exits 2.
 .SH EXAMPLES
 .nf
 gasm verify \-\-call add \-\-args a=2,b=3 hello_amd64.s
-gasm verify \-\-ground\-truth k.s
-gasm verify \-\-fuzz \-n 500 k.s
+gasm verify \-\-ground\-truth k_amd64.s
+gasm verify \-\-fuzz \-n 500 k_amd64.s
 .fi
 .SH SEE ALSO
 .BR gasm (1),