tdd-wf

Test-driven feature-build workflow for an unfamiliar codebase: map it into a navigable wiki and a C4 architecture model, cut the task into vertical walking-skeleton slices (each E2E-testable), drive every slice through /red → /green → /refactor with outside-in TDD, shift-left gating, and atomic feature-scoped commits, then /presubmit (full real gate + parallel multi-agent grading panel). Stack-agnostic.