test(generate): lock in init_module vs finit_module classification

Audit of init_module (man 2 init_module) confirmed the implementation is
correct: init_module(void *module_image, unsigned long len, const char
*param_values) is classified KindModule (null_event), capturing neither
an fd nor a path — param_values is a module-parameter string, not a
filesystem path. finit_module(int fd, ...) is classified KindFd via
field-based matching and captures fd = args[0]. Both syscalls live in the
Security family and match docs/syscall-tracing-plan.md.

No explicit finit_module test or init_module-vs-finit_module distinction
test existed, so add lock-in coverage:
- testdata.go: real-layout Format constants for (f)init_module enter/exit.
- classify_test.go: assert init_module=KindModule with no PathnameField
  and finit_module=KindFd.
- codegen_test.go: assert generated BPF C for init_module captures no fd
  and no filename/path, while finit_module captures fd = args[0].

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

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