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7a215eca - [LTX-2.3] Add modular pipeline modules and registration

[LTX-2.3] Add modular pipeline modules and registration Adds the LTX-2.3 modular pipeline structure: - modular_pipelines/ltx2/: encoders, modular_blocks, modular_pipeline - Registration in __init__.py, auto_pipeline.py, modular_pipeline mapping - Checkpoint utilities for parity testing - Supports T2V with CFG guidance (pixel-identical to reference) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>