test(finit_module): lock in family and ret classification

The finit_module audit (task 8t) confirmed the tracing implementation
matches man 2 finit_module: KindFd with fd at args[0], param_values
string never captured as a path, exit UNCLASSIFIED, and FamilySecurity
alongside init_module/delete_module. No implementation discrepancies
were found.

Extend TestClassifyInitModuleVsFinitModule to also assert the
previously-untested dimensions so the classification stays pinned:
- finit_module captures no path (empty PathnameField), like init_module
- both module-loading syscalls are FamilySecurity
- both exits are UNCLASSIFIED (0/-1 return, no byte count)

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

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