//! ONNX to IR conversion phases
//!
//! This module contains the distinct phases of ONNX graph conversion:
//!
//! 1. **initialization** - Create GraphState, process initializers
//! 2. **node_conversion** - Convert ONNX nodes, extract constants
//! 3. **type_inference** - Infer types iteratively with preferences
//! 4. **post_processing** - Identity elimination, constant re-lifting
//! 5. **finalization** - Remove unused constants, build final graph
//!
//! All phase-specific helper functions are inlined into their respective phase modules.
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