Produce a single per-feature engineering plan combining technical design (architecture, test strategy, rollout, baseline/deviation) and the Stories/Tasks section (agile `As a / I want / so that` + commit-sized tasks with concrete Diff Scope). Replaces the prior split between woos-feature-design and
Produce a single per-feature engineering plan combining technical design (architecture, test strategy, rollout, baseline/deviation) and the Stories/Tasks section (agile `As a / I want / so that` + commit-sized tasks with concrete Diff Scope). Replaces the prior split between woos-feature-design and woos-story-decomposition.