chore: add CLA workflow (superseded)

[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

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[jan-kubica]

Superseded by #222.