Module registry 

Spec registry for loading and querying function specifications.

The registry loads specs from multiple directories with a defined precedence order:

1. ./saf-specs/*.yaml — project local (highest priority)
2. ~/.saf/specs/*.yaml — user global
3. <binary>/../share/saf/specs/*.yaml — shipped defaults
4. $SAF_SPECS_PATH/*.yaml — explicit override (if set)

Structs

SpecRegistry

A registry of function specifications.

Enums

RegistryError

Errors that can occur when loading the registry.