CEXT-6221: default generated actions to nodejs:24; document Node.js version policy

[obarcelonap]

Description

• Bumps the default runtime for all generated actions from nodejs:22 to nodejs:24, the latest App Builder Runtime version with prewarm support
• Documents the Node.js version support policy in the root README.md, fulfilling the outstanding gap noted in the spec (CEXT-6221)
• Updates all examples and plugin SKILL.md files to reflect the new default

Related Issue

CEXT-6221

Motivation and Context

The Node.js version policy spec (specs/features/CEXT-6221-node-version-policy.md) was marked implemented but the README was never updated. This PR closes that gap.

On the codegen default: Node 24 prewarms became available in App Builder Runtime ~4 months ago. Per the documented policy, the codegen default tracks the latest App Builder Runtime version with prewarm support — nodejs:22 is now stale by that definition.

How Has This Been Tested?

pnpm test — all workspace tests pass.

Screenshots (if appropriate):

N/A

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have read the DEVELOPMENT document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: b87a9cc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@adobe/aio-commerce-lib-app	Minor

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[iivvaannxx]

@obarcelonap This fragment also needs updating

aio-commerce-sdk/packages/aio-commerce-lib-app/docs/usage.md

Lines 106 to 109 in ad3d980

	> [!NOTE]
	> Generated actions default to the `nodejs:22` runtime. To target a different runtime (for example `nodejs:24`), set the `runtime` field on the action in the generated `ext.config.yaml`. Codegen preserves a `runtime` you set there, so it survives regeneration.