docs(readme): add 'For contributors' section (!1753) · Merge requests · GitLab.org / orbit / GitLab Orbit · GitLab

What does this MR do and why?

Testing

Performance Analysis

This merge request does not introduce any performance regression. If a performance regression is expected, explain why.

Agent context — long-form analysis, file-by-file walkthroughs, profiler output, alternatives considered

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