#3518 refactor: Consolidate exception definitions into the `singer_sdk.exceptions` module Pull request opened by edgarrmondragon Links Summary by Sourcery Consolidate and document the exception hierarchies for the SDK and Singer protocol layers while centralizing scattered exceptions into

singer_sdk.exceptions

and clarifying their usage. Enhancements: • Move discovery- and configuration-related exceptions (

MapperNotInitialized

,

EmptySchemaTypeError

,

SchemaNotFoundError

,

SchemaNotValidError

,

UnsupportedSchemaFormatError

) into the unified

singer_sdk.exceptions

hierarchy and expose a backward-compatible

UnsupportedOpenAPISpec

alias. • Introduce a dedicated Singer protocol exception hierarchy in

singer_sdk.singerlib.exceptions

(

SingerError

→

SingerReadError

→

InvalidInputLine

) and keep it separate from

SingerSDKError

. • Simplify and realign exception tests to cover the expanded hierarchy, including new configuration and discovery errors and the Singer protocol hierarchy, while removing obsolete

__all__

and leaf-instantiation checks. Documentation: • Update error design and hierarchy documentation to reflect completed Phase 2, the consolidated SDK exception tree, and the separate Singer protocol exception hierarchy. meltano/sdk