Fix unhandled rejection turn ordering (GOL-392)

[noise64]

Summary

• add a private Node-style process turn checkpoint that drains nextTick, QuickJS jobs, and rejection events to a fixpoint before the next host callback
• preserve handler opportunities, exact-promise suppression, rejectionHandled ordering, listener exception routing, and timer cancellation in both P2 and P3
• cover P3 raw exports, resource construction, and async import settlement boundaries
• enable three passing public Node compatibility tests and regenerate the compatibility report

Validation

• P2 and P3 unhandled_rejection_turn_ordering
• P2 and P3 require_esm_rejection_tracking and timeout_3
• P2 and P3 focused unhandled-rejection node compatibility cases
• P3 async export/import boundary and exported-resource roundtrips
• node compatibility report generation/currentness
• module-resolution DTS goldenfile
• cargo fmt --all -- --check

The final candidate SHA 7e272ac48da3456883798e76194d5c08ad87cc92 passed independent queued verification and read-only Codex and Claude delta reviews.

Linear: GOL-392