- Print suggested /pad prompts after `pad init` creates a new workspace
- Add `pad onboard` command that detects project tooling (language, build system,
test runner, CI, linter) and suggests matching conventions from the library
- Replace empty workspace welcome box with OnboardingChecklist component showing
a 4-step guided setup with progress bar and /pad prompt hints
- Add contextual tips with /pad prompts to empty collection states
- Add onboarding workflow to /pad skill for agent-driven codebase analysis
- Fix relation fields storing slugs instead of UUIDs: server now resolves
slugs/refs to UUIDs for relation-type fields on both create and update