fix(ext/node): start proxy loop at index 0 in Readable.prototype.wrap() - #36566

Ports the upstream Node.js PR #64048, which fixes the method-proxying loop in Readable.prototype.wrap() to start at index 0 (nodejs/node#64048).

Previously, the method-proxying loop in Readable.prototype.wrap() started at index 1, silently skipping streamKeys[0] and leaving the method at the first own-enumerable key of the wrapped stream unproxied. The bug was introduced in nodejs/node@ee9e2a2 when ArrayPrototypeForEach(ObjectKeys(stream), ...) — which iterates from index 0 — was rewritten as a manual for loop for performance. The faithful translation starts at 0; a sibling loop converted in the same commit already correctly does so. The bug stayed hidden because keys[0] is usually _events (a non-function), which the loop's typeof guard skips anyway.

This structurally aligns Deno's ext/node/polyfills/internal/streams/readable.js with Node's by changing for (let j = 1; ...) to for (let j = 0; ...) so the proxy loop iterates over every own-enumerable key of the wrapped stream.

The proxying logic is otherwise unchanged: a key is still only proxied when this[i] === undefined && typeof stream[i] === "function", so the previously-skipped first key (typically _events) continues to be safely ignored while any real first method is now correctly bound.

Enables the upstream parallel/test-stream2-readable-wrap-proxy-methods.js, which asserts that a function on the first own-enumerable key of the wrapped stream is proxied onto the Readable.

AI Disclosure:
This PR was prepared with the assistance of an AI coding tool. The underlying code port was authored by a human; the AI was used to audit and analyze the change, compare it against the upstream Node.js PR, and draft this description.