Audit core foundation for Node 24 / Haxe 4+

[kevinresol]

Summary

• Section 1 (events, stream(+promises), buffer, timers(+promises), process, module/require, console, string_decoder, constants, Node.hx globals) audited against Node.js v24 Active LTS.
• Removed remaining Haxe 3 #if haxe4 / haxe_ver / untyped __js__ branches; Haxe 4+ only (js.lib.*, js.Syntax.code, arrow types, enum abstract).
• Filled notable public API gaps: events utils (on, addAbortListener, captureRejections, EventEmitterAsyncResource), stream helpers (compose, duplexPair, addAbortSignal, fromWeb/toWeb, promises), buffer (copyBytesFrom, kStringMaxLength, resolveObjectURL), process (memory/CPU/resource helpers, warnings, finalization/permission package, more events), module (isBuiltin, source-map/strip/registerHooks stubs).
• Minimal docs: README/haxelib Node 24 notes; HOWTO drops @:enum Haxe 3 syntax.

Remaining TODOs (cross-section)

• section-5: process IPC channel/sendHandle, module SourceMap / registerHooks typing
• section-6: web stream types for Readable/Writable/Duplex fromWeb/toWeb, buffer resolveObjectURL → Blob
• section-7: type EventEmitterAsyncResource.asyncResource as async_hooks.AsyncResource
• Console/require/exports keep intentional Dynamic (variadic / module load surfaces)
• Aggregate constants module left as historical crypto subset (prefer module-specific constants)

Test plan

• haxe build.hxml (ImportAll + examples) succeeds on this branch
• CI: Haxe 4.0.5 / 4.3.7 / latest
• Spot-check typed usage of new Events.on / Stream.compose / Process.hrtimeBigint / Module.isBuiltin

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