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Clarify measured and modelled RT60 results
7830440
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Fix per-band absorption handling; forward-compat pandas
SRT757 +1: Claude Opus 4.8- NR is now computed per octave band, not as one scalar from absorption summed across bands. The AI dot count is spectral, so the scalar shift mis-credited frequency-selective treatments (~2.2 dB at 125 Hz for a bass trap). - The broadband facade dB(A) model now uses a mid-frequency (500 Hz / 1 kHz) single-figure absorption instead of the sum of six per-band absorptions, which was ~6x too large and depressed the facade path by ~7.8 dB. - Replace pandas APIs removed/deprecated in 2.2/3.0; pin pandas <3.0. - Frequency headers now parse case-insensitively (1kHz as well as 1KHz). - Add tests/test_frequency_band_handling.py. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>e1f0d3e