chore: move to Node 24.21.0

[altaywtf]

Problem

The repo pinned Node 24.19.0; 24.21.0 is the current Node 24 release. Dependabot does not bump .node-version, so the pin fell behind.

Solution

Bump the Node pin in .node-version to 24.21.0. engines ranges stay as they are.

Proof

pnpm run verify passed locally on Node 24.21.0.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-23T15:20:38.148041Z	d3c4aac	PR opened

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[Copilot]

Copilot review overview

🟢 Approval recommended

The change is a straightforward Node pin bump with no code-path impact and matches the PR description.

Review effort: Lite
Findings: None

What changed in this PR

This PR updates the repository’s pinned Node.js version to keep local/dev and CI environments aligned with the current Node 24 patch release, without changing the supported engines ranges.

Changes:

• Bump .node-version from 24.19.0 to 24.21.0.

File	Description
.node-version	Updates the pinned Node.js version used by developer tooling/version managers.

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