#10213 refactor: Raise more consistent errors when a schedule, environment or plugin variant is not found Pull request opened by edgarrmondragon Description SSIA Checklist • I have read the contribution guide Was generative AI tooling used to co-author this PR? • Yes (please specify the tool below) Related Issues • Closes #XXXX Summary by Sourcery Unify not-found error handling across schedules, environments, and plugin variants by using a shared NotFound/MeltanoError pattern and name-based lookup helpers. New Features: • Add NameEq.find_by_name helper for name-based lookup on mixin-based objects. Bug Fixes: • Raise consistent NotFound errors when schedules, environments, and plugin variants are missing instead of custom schedule-specific exceptions. Enhancements: • Make NotFound a MeltanoError with standardized messages for missing objects. • Refine equality and hashing semantics for NameEq objects and add typing improvements. • Improve Environment.find and environment removal behavior to use the shared NotFound error semantics. • Update plugin variant and extra settings lookup to use typed find_by_name helpers instead of the generic find_named utility. Documentation: • Update error documentation to show a StoreNotSupportedError example instead of the removed ScheduleDoesNotExistError. Tests: • Adjust schedule, environment, and plugin tests to assert the new NotFound and VariantNotFoundError behaviors and to use type-annotated ScheduleService in tests. meltano/meltano