Rust test code cleanup

[leerob]

Remove redundant comments from Rust tests and improve test/variable naming for better clarity.

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Note

• Test cleanup only: Removed redundant comments, clarified test names, and simplified assertions/fixtures across compress/*, decode/*, png/*, jpeg/*, simd/*, and tests/*.
• Minor assertion/data tweaks: Consolidated test data arrays, standardized expected values (e.g., removed inline comments), and kept behavior identical (e.g., crc32, adler32, DEFLATE/INFLATE, PNG/JPEG roundtrips).
• Scope: No production logic changes; updates are confined to tests for readability and consistency.

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Project	Deployment	Review	Updated (UTC)
pixo	Ready	Preview, Comment	Dec 30, 2025 0:15am