refactor: switch to typed sentinel errors#23
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danpasecinic
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This pull request refactors error handling across the codebase to use sentinel error values for key container errors, improving reliability and type safety when checking error conditions. Instead of relying on string matching, errors are now wrapped with and checked against sentinel values, ensuring that error identity is preserved across package boundaries. The changes also include comprehensive tests to verify error detection across the public/internal seam.