Bun parity: correct Atomics wait fallback semantics

Scope

Port Bun's js/web/atomics.test.ts at corpus position 4087 by correcting the Home compatibility behavior for atomic waits on SharedArrayBuffer-like storage.

Problem

The fallback currently converts every native Atomics.wait() rejection on Home's SharedArrayBuffer-compatible backing into "timed-out". This masks the required immediate "not-equal" result and can also hide invalid typed-array/index errors.

Acceptance criteria

• return "not-equal" immediately when the current value differs
• retain "timed-out" for matching values with an elapsed timeout
• validate waitable typed-array kinds and bounds instead of masking failures
• preserve structured operation/cause stacks for fallback validation failures
• focused upstream file passes with zero failures/unsupported tests
• permanent regression coverage is added

Tracked from #66.

Implemented and pushed to main in 9cf0f953a (fix(atomics): preserve wait outcomes and diagnostics).

The shared Atomics wait-state path now:

• returns "not-equal" immediately when the observed value differs
• preserves matching-value timeout behavior
• normalizes expected values and timeout inputs for Int32Array and BigInt64Array
• rejects non-waitable typed arrays, non-shared memory, and invalid bounds instead of masking them as timeouts
• gives waitAsync correct synchronous mismatch/zero-timeout outcomes and asynchronous timeout resolution
• emits structured ERR_ATOMICS_WAIT errors with operation, typed-array kind, safe index, original cause, and a composed operation/cause stack

Verification:

• focused js/web/atomics.test.ts: 28 passed, 0 failed, 0 todo, 0 unsupported, 0 allowed-empty
• positions 4084–4087 together: 4 files, 40 passed, 0 failed, 0 todo, 0 unsupported, 0 allowed-empty
• permanent gRPC error-stack suite: passed
• permanent SQL adapter contracts: passed
• permanent third-party/error-diagnostic suite: passed (53 diagnostic/invariant cases)

This completes the acceptance criteria. Parent tracker: #66.