Verify tests immediately after non-semantic refactors

When restructuring code that has a working test suite, re-run the exact same battery of tests right after — not at the end. Catching a regression while the diff is small and the change is one logical unit makes triage trivial; waiting until five files are touched and four tests are failing is brutal. Even pure cosmetic edits (whitespace, variable renames, splitting set literals across lines) can silently break things if a quote is mistyped or a refactored variable is referenced elsewhere.