node:v8: implement promiseHooks lifecycle callbacks

[andrewtdiz]

Summary

v8.promiseHooks should expose promise lifecycle callbacks through onInit, onBefore, onAfter, onSettled, and createHook. Perry currently has no public node:v8 namespace implementation for this promise lifecycle surface.

Node Behavior

A minimal Node probe shows the observable hook contract:

const v8 = require("node:v8");
const events = [];
const stops = [
  v8.promiseHooks.onInit((promise, parent) => events.push(["init", promise instanceof Promise, parent instanceof Promise])),
  v8.promiseHooks.onBefore((promise) => events.push(["before", promise instanceof Promise])),
  v8.promiseHooks.onAfter((promise) => events.push(["after", promise instanceof Promise])),
  v8.promiseHooks.onSettled((promise) => events.push(["settled", promise instanceof Promise])),
];
Promise.resolve(21).then(v => v + 1).then(v => events.push(["result", v]));
setTimeout(() => { console.log(events); stops.forEach(stop => stop()); }, 20);

Observed on Node v25.9.0: each on* method returns a function-valued stop handle; callbacks receive Promise objects during promise creation/execution/settlement; after calling the stop handles, later promises no longer trigger those callbacks. promiseHooks.createHook({ init, before, after, settled }) returns a function-valued stop handle. Missing or non-callable hook callbacks throw TypeError ERR_INVALID_ARG_TYPE for covered cases.

Perry Behavior

docs/runtime-parity.md marks v8.promiseHooks.onInit, onSettled, onBefore, onAfter, and createHook missing. docs/runtime-parity-gaps.md tracks node:v8 as a whole-module gap, source search found no public node:v8 promise-hook implementation, and there is no dedicated V8 parity fixture in this checkout.

Suggested PR Cut

Batch this with related issues in:
#3295 - node:v8: lifecycle callback namespaces parity cut

Good batch candidates:

• node:v8: expose startupSnapshot helper state #3141

Do not batch with:

• unrelated modules
• broad subsystem rewrites
• fixes needing different test harnesses
• serialization/heap-stat diagnostics (node:v8: expose serialize and deserialize round trips #3137, node:v8: expose heap statistics shape #3138, node:v8: expose Serializer and Deserializer class APIs #3294)
• heap snapshot stream/file output
• profiler handle APIs

Acceptance

• A parity/regression test proves onInit, onBefore, onAfter, and onSettled invoke callbacks for a deterministic promise chain and return stop functions.
• Calling stop functions prevents later callbacks for covered cases.
• promiseHooks.createHook() installs the same callback set and returns a stop function.
• Missing/non-callable callbacks throw Node-compatible errors for covered cases.
• Related known-failure/docs/manifest entries are updated if touched.