feat: Ensure support of node 26

[dprevost-LMI]

Add node 26 support in the CI

[greptile-apps]

Greptile Summary

Adds Node.js 26 to the CI test matrix and updates the playground lock file version reference. No application logic is changed.

• .github/workflows/test.yml: Node 26.x is appended to the existing matrix [20.x, 22.x, 24.x], so four Node versions are now exercised on every push and PR.
• playgrounds/package-lock.json: The root package version entry is updated from 5.6.8 to 5.6.9, consistent with a recent release bump.

Confidence Score: 5/5

Safe to merge — changes are limited to CI configuration and a lock-file version reference with no impact on library code.

The only changes are adding Node 26.x to the test matrix and reflecting a version bump in the playground lock file. No library code, tests, or configuration that affects runtime behavior is touched.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/test.yml	Adds Node 26.x to the CI test matrix alongside existing 20.x, 22.x, and 24.x versions
playgrounds/package-lock.json	Bumps the local root package reference from 5.6.8 to 5.6.9 in the playground lock file

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Push / PR event] --> B[CI: linux job]
    B --> C{Node version matrix}
    C --> D[Node 20.x]
    C --> E[Node 22.x]
    C --> F[Node 24.x]
    C --> G[Node 26.x ✨ new]
    D --> H[npm install --force]
    E --> H
    F --> H
    G --> H
    H --> I[npm run checks:all]
    I --> J{Pass?}
    J -- Yes --> K[✅ Green]
    J -- No --> L[❌ Fail]

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A[Push / PR event] --> B[CI: linux job]
    B --> C{Node version matrix}
    C --> D[Node 20.x]
    C --> E[Node 22.x]
    C --> F[Node 24.x]
    C --> G[Node 26.x ✨ new]
    D --> H[npm install --force]
    E --> H
    F --> H
    G --> H
    H --> I[npm run checks:all]
    I --> J{Pass?}
    J -- Yes --> K[✅ Green]
    J -- No --> L[❌ Fail]

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_{Reviews (2): Last reviewed commit: "setup playground following release" | Re-trigger Greptile}