fix(node): tighten EventEmitter core semantics

[andrewtdiz]

Closes #4417.

Summary

• Decode EventEmitter event names from raw JS value bits in perry-ext-events, including symbol-backed names and coerced names on the same instance-method path.
• Deliver full variadic emit() args with the correct this, resolve events.once() with the emitted args array, and route captureRejections listener promise failures to error.
• Treat small native EventEmitter handles as terminal in instanceof before probing stream objects, avoiding heap-object dereferences for raw handle payloads.

Validation

• cargo fmt --check
• cargo check -p perry-ext-events -p perry-runtime
• cargo test -p perry-ext-events
• cargo build -p perry-ext-events --release
• cargo build -p perry-runtime --release
• git diff --check
• ./scripts/check_file_size.sh
• jq empty test-parity/known_failures.json
• Direct Node oracle runs for selected fixtures: events/emitter/emit-multiple-args.ts, event-names-symbols.ts, instanceof.ts, capture-rejections.ts, events/imports/default-import.ts, named-imports.ts
• Direct Perry runs with branch-local optimized runtime/stdlib and branch libperry_ext_events.a: selected fixture output matches Node; event-names-symbols, instanceof, capture-rejections, default-import, and named-imports exit 0; emit-multiple-args prints matching output but remains alive until the 8s timeout.