Bust README logo cache

[offyotto]

The logo PNG itself is fixed, but GitHub's rendered README can keep serving the old proxied/cached image because the image URL did not change. Add a version query to the README image source so GitHub fetches the repaired asset under a new cache key.

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Code Review ✅ Approved

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Adds a version query parameter to the README logo URL to force GitHub to fetch the repaired image under a new cache key. No issues found.

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