stacks-implement

# Implement Read [the Stacks adaptation rules](../stacks-flow/ENGINEERING.md), then [PLAYBOOK.md](PLAYBOOK.md). The playbook preserves this workflow's decision criteria; the Stacks rules govern APIs, tooling, tracking, and authorization. Credit: adapted from Matt Pocock's `implement` skill, MIT licensed. See [NOTICE.md](NOTICE.md) and [LICENSE](LICENSE). ## Completion Produce the requested behavior or reviewable artifact and satisfy the playbook's completion criteria. Preserve existing decisions and user edits. Use the native Stacks skills for implementation and verification, and carry existing authorization through the workflow.