chore: add CLA workflow

[jan-kubica]

Summary

Adds the standard Stella CLA Assistant workflow for pull requests and CLA signature rechecks.

Validation

• Compared the workflow content against the canonical Stella workflow.
• No code tests run; this is a GitHub Actions workflow-only change.

CC on behalf of @jan-kubica

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 52553cf4-e60a-4b2f-99a7-0d1e15fbd460

📥 Commits

Reviewing files that changed from the base of the PR and between fe7012b and bac12f4.

📒 Files selected for processing (1)

• .github/workflows/cla.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-cla-workflow

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