Module lower 

AST to IR Lowering Pass

Converts the parsed AST into the AI-facing IR format. This pass:

• Generates unique IDs for all definitions
• Infers types where needed (or uses placeholders)
• Propagates evidentiality through expressions
• Normalizes pipeline operations

Structs

LoweringContext

Lowering context

Functions

lower_source_file

Lower a complete source file to IR