[Feature Request] Node.js 26 support (nodejs26.x)

首先檢查現有的執行階段分支、NODE_MODULE_VERSION 參照，以及建置和測試 Lambda Runtime Interface Client 的 CI 矩陣。確認 Node.js 26 基礎映像檔這項先決條件，然後在 nodejs26.x 分支和發行目標以 Node.js 26 為目標、使用版本 147 並通過其 CI 覆蓋率後，視為工作完成。

Summary
Node.js 26 was released on 2026-05-05 as the upcoming LTS version. This issue tracks the request to add official Node.js 26 support to the Lambda Runtime Interface Client.

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Requested changes

• Create a new nodejs26.x branch and release targeting the Node.js 26.x runtime
• Update NODE_MODULE_VERSION to 147
• Update CI matrix to build and test against Node.js 26

Why this matters for this repo
The RIC includes native (C++) bindings that are tightly coupled to the Node.js ABI version.
The V8 upgrade to v14.6 in Node.js 26 changes NODE_MODULE_VERSION to 147, meaning any native addon compiled against Node.js 24 will not load under Node.js 26 without a rebuild. Lambda customers using custom container images with the RIC need a nodejs26.x-compatible release to avoid runtime failures after upgrading.

Notable Node.js 26 changes relevant to this repo

• V8 updated to v14.6
• NODE_MODULE_VERSION bumped to 147
• TypeScript support is now stable by default (no longer requires --experimental-transform-types)
• Temporal API is now enabled by default

Prerequisite: https://github.com/aws/aws-lambda-base-images/issues/488 - Add Node.js 26 base image (public.ecr.aws/lambda/nodejs:26)

The Lambda base image for nodejs26.x must exist before this RIC release can be built and tested against the new runtime.