fix: align TexFilter gating with TSLANet

[Entr000py]

Summary

• replace the SE block's temporal squeeze with an explicit mean pool so it no longer relies on unsupported adaptive pooling shapes
• align the energy-gated TexFilter with the TSLANet mask formulation by using the variable-dimension frequency count, a trainable threshold, and a straight-through energy mask

Testing

• python -m compileall TexFilter.py

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Codex Task