family: classify futex syscalls as IPC instead of Misc

Audit of futex_wake found that the futex family syscalls (futex,
futex_wait, futex_wake, futex_requeue, futex_waitv) were absent from the
syscallFamilies map and fell through to FamilyMisc. Per futex(2) ("fast
user-space locking"), these are shared-memory synchronization/IPC
primitives, conceptually identical to the System V semaphores
(semop/semget) already tagged FamilyIPC. Group them under IPC so
per-family aggregation/reporting bins them with the other synchronization
primitives.

Argument and return-value handling were already correct: futex_wake's
first arg (uaddr) is a userspace pointer, captured via KindFutex
(null_event), and the exit ret_event records the woken-waiter count
(>=0) or -1 on error.

Add lock-in unit tests in family_test.go and regenerate the C/Go
artifacts (generated_tracepoints.go, generated_types.go).

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

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