22af40413d
Stream A (atomics) foundation. Net-new atomic load/store codegen path, wired end-to-end except LLVM emission, which deliberately bails loudly so the example locks to a clean diagnostic (A.0b turns it green — cadence: no commit both adds a test and makes it pass). - library/modules/std/atomic.sx: Ordering enum, Atomic($T) transparent wrapper (init/load/store, seq_cst-only for now), atomic_load/atomic_store #builtin intrinsics. Opt-in import, NOT in the universal std facade (Ordering in the prelude grows every program's type table + churns 37 .ir snapshots). - IR: atomic_load/atomic_store ops + AtomicOrdering (all 5) + structs (inst.zig); print arms; comptime_vm arms reuse load/store (single-thread correct); recognizer tryLowerAtomicIntrinsic (const-ordering + scalar-size guards, both loud); emit dispatch -> emitAtomicLoad/Store bail via comptime_failed. - examples/1700-atomics-load-store.sx locked to the bail diagnostic. Full ordering surface (a.load(.acquire)) blocked on comptime-constant ordering propagation (comptime enum value params) — A.0.5, migrated not legacy.
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