Files
sx/tests/expected
agra f4faef97dd ffi M4.B setter: emit ARC ops in sx-defined property setters
emitObjcDefinedPropertySetter now dispatches on objcPropertyKind to
emit the right runtime ops per Apple's ARC contract:

- assign  → bare store (primitives, explicitly opted-out object slots).
- strong  → load old; objc_retain(new); store new; objc_release(old).
            Apple's runtime treats release(NULL) as a safe no-op, so
            no explicit null-check on the old value.
- weak    → objc_storeWeak(field_addr, val) — handles first-store
            (init) and re-store (destroy + init) atomically. Registers
            the slot with libobjc's side-table; the runtime auto-nils
            it when the target deallocates.
- copy    → [val copy] (sends `copy` selector — returns retained per
            the NSCopying contract); load old; store the copied
            instance; release old.

Side-effect on the weak path: even with the bare-load getter still in
place (loaded directly from the slot), weak reads work because Apple's
runtime side-table-nils the slot at target dealloc. The getter
improvement via objc_loadWeakRetained is the next commit and is
needed for race-safe reads (between load and use, the target could
deinit on another thread); for the single-threaded test scenarios
the bare load is sufficient.

ffi-objc-arc-02-strong-property advances from "child dealloc'd at
midpoint" to "unbalanced; alloc=2 dealloc=1" — strong setter now
retains, but the M4.B-dealloc cleanup hasn't landed so the child
held by the property isn't released when the parent deallocates.
Final commit (M4.B dealloc) closes the loop.

ffi-objc-arc-03-weak-property turns fully green: storeWeak +
auto-nil side-table do the work.

189/189 example tests pass; chess on iOS-sim green.
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