sw-implement-feature

Implement a feature from its technical spec (specs/NNNN-slug-spec.md, written by sw-design-solution) following TDD — tests first per acceptance criterion, then the implementation, fixing until every relevant test passes (including that AC's own acceptance/e2e test, run immediately, not deferred), running Shopware's own shopware-cli fixers/static-analysis per AC to conform to Shopware's coding standards as code is written rather than after the fact. Builds ACs group by group per the spec's Parallel groups/Depends on data, fanning out independent ACs to concurrent agent spawns instead of one at a time. Runs sw-verify-feature as its final step to produce a full verification report. Use when asked to implement, build, or code a feature/epic from an existing tech spec.