Fix method name typo and import issues across model files

[Copilot]

Overview

Found and fixed critical errors preventing model instantiation: typo in validation method name and import inconsistencies.

Changes

• Fixed method name typo across all models (20 occurrences): timestep_validatate → timestep_validate

  • models/CGLE.py (4 occurrences)
  • models/NS.py (5 occurrences)
  • models/QG.py (4 occurrences)
  • models/S_MHD.py (4 occurrences)
  • models/ETD_KT_CM_JAX_Vectorised.py (3 occurrences)

• Removed duplicate import os statement in models/CGLE.py

• Changed to relative import in filters/__init__.py: from filters.resampling → from .resampling

Impact

Without this fix, all model classes would raise AttributeError on instantiation:

# Before: crashes with AttributeError: 'CGLE_SETD_KT_CM_JAX' object has no attribute 'timestep_validatate'
model = CGLE_SETD_KT_CM_JAX(params)

# After: works correctly
model = CGLE_SETD_KT_CM_JAX(params)  # Calls timestep_validate() successfully

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