Add the root v1 product/onboarding playbook: normal authoring path, mental model, production boundaries, escape hatches, versioning/deploy compatibility, example hierarchy, and local checks. This is intentionally documentation-only; the production SaaS tutorial app remains future work.
req: pitch/001
req: canonical_authoring/001
req: public_api/005
req: auth/001
req: abi/001
slhx agent