Fix native batch async fallbacks

[platypii]

Summary

• recognize promises and cross-realm thenables through one shared helper while preserving the synchronous column fast path
• resolve row cells concurrently within each bounded row-to-batch buffer
• share row-scope detection and keep unambiguous qualified aggregate inputs on the native batch path
• cover bounded concurrent materialization, foreign-realm promises, and qualified aggregates with regression tests

Benchmarks

Compared this branch with origin/master on Node v26.5.1. Each engine received one warm-up, followed by five alternating measured runs with explicit garbage collection. The table reports medians; every operation also checked its output for correctness.

Scenario	origin/master	This branch	Speedup
Deferred row cells: 128 rows × 4 columns, 1 ms cell latency, 64-row batches	599.37 ms	2.99 ms	200.43×
SELECT SUM(d.id) over 500,000 typed numeric values	198.98 ms	23.44 ms	8.49×

The deferred-cell case measures the bounded concurrency introduced by the row adapter; the aggregate case measures avoiding the row fallback for an unambiguous qualified identifier.

Validation

• npm test — 65 files, 1,982 tests passed
• npm run lint
• npx tsc