Ship a SaaS foundation you can prove

A starter can contain contracts for future integrations without advertising them as operational. Capability maturity makes that distinction executable and keeps public copy tied to evidence. It also gives a team a useful place to distinguish planned, scaffolded, implemented, and certified behavior.

Provider credentials and production data remain a separate certification boundary. A green local test suite proves implementation behavior in that environment. It does not prove the health of a live account, a preview deployment, or a production data path.

Every write crosses an authenticated server service and a shared Zod contract. Tenant predicates live beside the query, durable effects start in the same transaction, and repeated review knowledge becomes a reusable guardrail instead of a comment someone must remember.

That ownership model makes the foundation easier to customize. Product code can change quickly because identity, persistence, realtime, background work, and policy still meet at explicit boundaries.

• Parse the command once at the server boundary.
• Derive user and tenant identity from the authenticated session.
• Commit domain state, receipts, and durable handoff together when required.
• Return evidence that optimistic clients can reconcile precisely.

The strongest starter kit is not the one with the longest provider checklist. It is the one that tells the next developer which parts are safe to use, which checks establish that confidence, and which work remains before a capability should reach customers.

That is why registries, architecture ratchets, related tests, release certification, and canonical documentation live beside the application. They shorten future decisions and make drift visible while it is still inexpensive to fix.

“A foundation earns trust by making its limits as easy to find as its features.”