[codex] Align Atomics wait/notify receivers

[andrewtdiz]

Summary

• Track typed-array views created from SharedArrayBuffer so Atomics wait/notify validation can distinguish shared and non-shared receivers.
• Accept BigInt64Array receivers for Atomics.wait and Atomics.notify, while continuing to reject BigUint64Array and other typed-array kinds.
• Make Atomics.wait throw on non-shared Int32/BigInt64 views, and make Atomics.notify return 0 for non-shared views after kind/index validation.
• Add a focused globals parity fixture for Int32/BigInt64/BigUint64 wait/notify receiver behavior.

Validation

• Pre-fix reproduction with the new fixture: Perry returned timed-out for Atomics.wait(new Int32Array(new ArrayBuffer(...))) and then aborted on the first BigInt64Array wait with TypeError: Atomics wait/notify requires an Int32Array; Node 26 produced the expected TypeError/BigInt64 wait-notify outputs.
• npm exec --yes --package=node@26 -- node --experimental-strip-types test-parity/node-suite/globals/atomics-wait-notify-receivers.ts
• Direct Perry compile/run of atomics-wait-notify-receivers.ts with PERRY_NO_AUTO_OPTIMIZE=1 PERRY_ALLOW_UNIMPLEMENTED=1; Node/Perry diff empty.
• Direct Node/Perry diff for existing test-parity/node-suite/globals/atomics-wait-notify.ts; diff empty.
• CARGO_TARGET_DIR=/root/perry-worktrees/perry-node-webcrypto-cryptokey-property-exposure-20260604/target cargo check -q -p perry-runtime --lib
• RUSTFLAGS="-Awarnings" CARGO_TARGET_DIR=/root/perry-worktrees/perry-node-webcrypto-cryptokey-property-exposure-20260604/target cargo build -q -p perry-runtime
• RUSTFLAGS="-Awarnings" CARGO_TARGET_DIR=/root/perry-worktrees/perry-node-webcrypto-cryptokey-property-exposure-20260604/target cargo build -q -p perry
• cargo fmt --all -- --check
• git diff --check HEAD~1..HEAD
• ./scripts/check_file_size.sh

Note: the full run_parity_tests.sh harness was not used because it builds/uses release target/release/perry; this cut was validated with direct Node/Perry fixture comparisons using the rebuilt debug CLI and runtime archive.