[julia-script]

js_atomics_native no longer declares pthread mutex, condition or clock FFI.

• The shared waiter queue's lock is now a stdlib sync.Mutex<()>, held through guards.
• Each waiter sleeps on its own woken word with Atomic.wait and a relative timeout, so no per-waiter condition is needed and there are still no allocations under the lock.
• Notify and cancel set the word and wake the waiter while holding the lock, so the waiter's stack frame stays live through the wake. This is the same guarantee the stack condition had.
• Gone with the FFI: the opaque 64-byte NativeMutex/NativeCondition ABI envelopes, the target restriction, clock_gettime deadline math and the test's nanosleep.
• Spurious wakeups still return "ok", as before.

unsafe count in the file: 98 → 77.

Local gate: build clean, 512/512 tests including both waiter regression tests, all checks passed, and segb/collb/lpb/relb were SAME.

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Generated by Claude Code