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Introduces modern_di/exceptions.py with ModernDIError(RuntimeError) and a hierarchy keyed to the existing message templates: ContainerError, ResolutionError, RegistrationError, FinalizerError, GroupInstantiationError. Each subclass carries structured fields so callers can branch on type and introspect details instead of matching on RuntimeError message strings. Inheriting from RuntimeError preserves backwards compatibility for anyone catching the broad type today. Tests updated to assert the typed exceptions and verify the structured fields. Closes #177 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Introduces modern_di/exceptions.py with ModernDIError(RuntimeError) and a hierarchy keyed to the existing message templates: ContainerError, ResolutionError, RegistrationError, FinalizerError, GroupInstantiationError. Each subclass carries structured fields so callers can branch on type and introspect details instead of matching on RuntimeError message strings.
Inheriting from RuntimeError preserves backwards compatibility for anyone catching the broad type today. Tests updated to assert the typed exceptions and verify the structured fields.
Closes #177