Fix corrupted URL literal in snippets test

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Summary

• Restores the ? query separator in snippets::uri::compare_urls
• Cleans up the adjacent comment that was also affected by the mechanical rewrite

Validation

• cargo test -p snippets uri::compare_urls -- --nocapture
• cargo test -p snippets --lib
• cargo clippy --all-targets -- --deny warnings

Note: Full cargo test with Docker-backed services could not be run locally because Docker is not installed in this environment; the failing CI step was reproduced and fixed with the focused snippets test.