test(clock_nanosleep): lock in exit handler UNCLASSIFIED ret + args[2] request ptr

Audit of clock_nanosleep tracing confirmed the classification is correct:
KindSleep + FamilyTime (matching the nanosleep sibling), the enter handler
captures the request timespec at ctx->args[2] (not args[0]/clockid), and the
exit handler emits a plain ret_event with ret_type UNCLASSIFIED, which is
correct since clock_nanosleep returns 0 or a positive errno, never an fd or
byte count.

Strengthen the existing enter-handler test with the requested_ns -1 sentinel
and add TestClockNanosleepExitHandlerIsUnclassifiedRet to pin the exit-side
behavior. No classification, docs, or generated-code changes were needed
(mage generate produces no diff).

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

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