test(classify): lock in keyctl-family audit (kind/family/ret)

Audit of keyctl(2), add_key(2), request_key(2) confirmed the existing
tracing is correct: all three are KindKeyctl (operation + generic numeric
args captured via keyctl_event, no fd/path probe), live in FamilySecurity
alongside their *_key/landlock_*/lsm_*/seccomp siblings, and return an
operation-dependent value or -1 that is not a byte transfer (UNCLASSIFIED).

Add TestClassifyKeyctlAudit as a lock-in regression test, mirroring prior
audits: it asserts the Security family on both enter and exit names, the
UNCLASSIFIED return classification, and that add_key's const char *
type/description arguments are key metadata that must not trip the generic
pathname/open heuristics (PathnameField stays empty, kind stays KindKeyctl).

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

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