docs: add frontend onboarding docs

.pi/skills/arkie-frontend-onboarding/SKILL.md

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+---
+name: arkie-frontend-onboarding
+description: Onboard an AI agent to the Arkie Library frontend repo. Use when starting work in this repository, checking branch/deploy rules, or refreshing project context before coding.
+---
+
+# Arkie Frontend Onboarding
+
+Use this skill before making non-trivial changes in the Arkie Library frontend repo.
+
+## 1. Read project context
+
+Read these files in order:
+
+1. `README.md`
+2. `AGENTS.md`
+3. `docs/workflow.md`
+4. `docs/deploy.md` if the task touches deploy, CI, environment variables, or `main` branch pushes.
+
+## 2. Check current git state
+
+Run:
+
+```bash
+git status --short --branch
+git branch --show-current
+```
+
+Rules:
+
+- `main` is the production deploy branch.
+- `terry-staging` is the staging/work branch.
+- Do not commit or push unless Terry explicitly asks.
+
+## 3. Recall memory
+
+Search project memory for relevant context before decisions, especially for:
+
+- branch/deploy workflow
+- frontend conventions
+- admin UI behavior
+- TypeScript/format failures
+- prior fixes touching the same files
+
+## 4. Validate before finishing
+
+For code changes, run:
+
+```bash
+npx tsc --noEmit
+npm run format:check
+```
+
+Run `npm run build` when changes affect routes, config, build, deploy, env vars, or dependencies.
+
+## 5. Report clearly
+
+Summarize:
+
+- files changed
+- commands run and results
+- current branch/status
+- whether anything needs pull/push/deploy