test(rmdir): lock in FS family, args[0] pathname capture, UNCLASSIFIED exit

Audit of the rmdir(2) syscall found the tracing implementation already
correct and fully consistent with its siblings: rmdir is in the FS family,
classified KindPathname with the pathname captured from args[0] (its generated
BPF C handler is byte-identical to unlink's), and its exit is a ret_event with
UNCLASSIFIED ret_type (rmdir returns int 0/-1, not a byte count). The docs and
drift tests, integration tests (unlink-rmdir success and unlink-rmdir-notempty
ENOTEMPTY failure), and retclassify coverage all already match.

To guard against future drift, add a dedicated rmdir lock-in:
- FormatRmdir tracepoint fixture (single const char * pathname at args[0],
  mirroring the real sys_enter_rmdir format and unlink's shape).
- TestGenerateRmdirHandlerCapturesPathFromArgs0: asserts the generated handler
  reads the path from args[0] (with a negative guard against args[1], since
  rmdir has no dirfd) and that the exit stays UNCLASSIFIED.
- TestRmdirFamilyAndKindMatchSiblings: asserts rmdir shares FamilyFS and
  KindPathname/pathname with unlink/unlinkat/mkdir.

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

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