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* test+refactor:custom-whitespace: add comprehensive testing with 73 testsCraig Jennings2025-10-261-0/+150
Refactor 4 whitespace manipulation functions (remove-leading-trailing, collapse-whitespace, delete-blank-lines, hyphenate-whitespace) to use interactive/non-interactive pattern for testability. Add 73 tests across 4 test files covering normal, boundary, and error cases. Fix linter warnings and add proper input validation.