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Planning a Large Refactoring: The Mikado Method, Branch by Abstraction and Parallel Run

A refactoring that doesn't fit in one PR is planned with a prerequisite graph found by trying and reverting with the Mikado Method, and carried out on the main branch with branch by abstraction in small commits that each stay green. The post replaces the static LegacyShippingClient with a typed HttpClient-based client in 13 commits; a parallel run catches two differences no test covered, and real output shows how static state breaks parallel tests.