chore(deps): update actions/setup-node action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-node	action	major	v4 → v6

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Release Notes

actions/setup-node (actions/setup-node)

v6

Compare Source

v5

Compare Source

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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Greptile Overview

Greptile Summary

Updated actions/setup-node from v4 to v6 in the Coana Guardrail workflow. This is a routine dependency update that maintains the same Node.js 20.x configuration. The action is only used to set up the Node.js environment for running npx commands with the Coana CLI tool. No functional changes to the workflow logic or behavior.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• This is a straightforward dependency version bump for a GitHub Actions workflow. The change updates actions/setup-node from v4 to v6 while maintaining the same Node.js 20.x configuration. The workflow only uses the action to set up the Node.js environment for running npx commands, and the explicit node-version specification ensures consistent behavior. No custom instructions were violated, and the change has no impact on the Python codebase or security policies.
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/coana-guardrail.yml	Updated actions/setup-node from v4 to v6, no breaking changes for this workflow

Sequence Diagram

sequenceDiagram
    participant PR as Pull Request Trigger
    participant GHA as GitHub Actions
    participant Setup as actions/setup-node@v6
    participant Git as Git Operations
    participant Coana as Coana CLI (npx)
    
    PR->>GHA: on: pull_request
    GHA->>Git: Checkout base branch
    Git->>GHA: Base branch checked out
    GHA->>Git: Fetch PR branch
    Git->>GHA: PR branch fetched
    GHA->>Git: Get changed files diff
    Git->>GHA: List of changed files
    GHA->>Setup: Setup Node.js 20.x
    Setup->>GHA: Node.js environment ready
    GHA->>Coana: Run Coana CLI on base branch
    Coana->>GHA: Generate main-branch report
    GHA->>Git: Reset file permissions
    Git->>GHA: Permissions reset
    GHA->>Git: Checkout current branch (clean)
    Git->>GHA: Current branch checked out
    GHA->>Coana: Run Coana CLI on current branch
    Coana->>GHA: Generate current-branch report
    GHA->>Coana: Compare reports
    Coana->>GHA: Comparison result posted

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