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Re-enable RMS-noise-based filtering in ProtoduneHD#467

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HokyeongNam wants to merge 1 commit intoWireCell:masterfrom
HokyeongNam:fix/protodunehd-rms-noise-filter
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Re-enable RMS-noise-based filtering in ProtoduneHD#467
HokyeongNam wants to merge 1 commit intoWireCell:masterfrom
HokyeongNam:fix/protodunehd-rms-noise-filter

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The RMS-noise-based filtering logic in ProtoduneHD is currently commented out.

When channels have large RMS noise, the DNN ROI can incorrectly identify noise fluctuations as signal.

This PR re-enables the existing RMS-noise-based filtering logic in ProtoduneHD.cxx to help reduce such false positive ROI responses in high-noise channels.

Key changes:
Restore the commented RMS-noise-based filtering logic in sigproc/src/ProtoduneHD.cxx

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