test(generate): lock in map_shadow_stack BPF handler field wiring

Audit of the x86 CET map_shadow_stack syscall (Linux 6.6+,
void *map_shadow_stack(unsigned long addr, unsigned long size,
unsigned int flags)) confirmed the existing tracing is correct:
KindMem / FamilyMemory classification, memFieldSpec wires
addr=args[0], length=args[1] (size), flags=args[2], length2=0, and
the return (mapped address or -errno) is captured generically as
ev->ret like every other KindMem exit. Docs and classify tests
already match.

The only gap was the lack of a codegen lock-in test for the BPF
handler field wiring, which mlock2/remap_file_pages/mprotect/brk all
have. Add TestGenerateMemHandlerMapShadowStack to guard against
future drift.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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