put.io frontend development

Apply shared put.io frontend engineering defaults after the target repository's own guidance and code precedent.

Start

1. Inventory nested guidance with git ls-files '*AGENTS.md' '*SKILL.md' and read the README.md and docs for the area being changed. Target-repo guidance, project-local skills, and code precedent override this skill.
2. Identify the repo kind, stack, verify entrypoint, delivery target, and runtime proof surface.
3. Select only the references required for the task.

Reference map