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

Assisted-by: DeepSeek V4.1 Flash

verify/jit.go

@@ -2,13 +2,16 @@
 // SPDX-License-Identifier: BSD-3-Clause
 
 // Package verify provides the dynamic-analysis substrate for gasm: it
-// JIT-assembles Plan 9 amd64 kernels into executable memory and calls them
+// JIT-assembles Plan 9 kernels for all four supported architectures
+// (amd64, arm64, riscv64, loong64) into executable memory and calls them
 // directly, enabling differential testing against portable Go references,
 // runtime ABI checks and basic-block coverage profiling.
 //
-// The execution model is pure Go (stdlib only): machine code is mapped with
-// syscall.Mmap and invoked through an assembly trampoline that switches to a
-// prepared ABI0 stack.  No cgo, no external toolchain.
+// The execution model is pure Go, stdlib only, with no cgo: machine code is
+// mapped with syscall.Mmap and invoked through an assembly trampoline that
+// switches to a prepared ABI0 stack.  The toolchain-comparison helpers in
+// this package (groundtruth.go) are the one exception, shelling out to the
+// installed Go toolchain and using its assembler as the differential oracle.
 package verify
 
 import (