Clarify distinction between filters and compression in performance guide #3626
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This PR adds a short conceptual section to the "Optimizing performance" guide
clarifying the difference between representation-level transformations
(filters / array-to-array codecs) and byte-level compression.
The goal is to explain why compression alone cannot remove unused bit-width
in certain data sources (e.g. sensor or ADC data), and why some performance
optimizations require changes in data representation rather than only tuning
compression parameters.
Documentation-only change.