put.io frontend development

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

Start

1. Read every filesystem AGENTS.md that applies from the target repo root to the files being changed, including untracked files. Then inventory tracked auxiliary guidance with git ls-files '*AGENTS.md' '*SKILL.md'.
2. Discover tracked project-local SKILL.md files under .agents/skills/, .claude/skills/, or skills/. Read the frontmatter and apply only the task-matching skills; ignore dependency and vendored trees.
3. Read the README.md sections and docs that cover the area being changed. Target-repo guidance and skills override this shared skill.
4. Identify the repo kind, stack, verify entrypoint, delivery target, and runtime proof surface.
5. Select only the references required for the task.