docs: rename build-a-saas-with-stack-auth tutorial slug to -hexclave

The MDX content was flipped to Hexclave in PR 1481, but the URL slug
itself (/guides/other/tutorials/build-a-saas-with-stack-auth) was still
public-facing. Rename the file and update the five internal links:

- docs.json navigation reference
- 3 in-MDX cross-links in build-a-team-based-app.mdx
- 2 in-MDX cross-links in ship-production-ready-auth.mdx

docs-mintlify/docs.json

@@ -154,7 +154,7 @@
               {
                 "group": "Tutorials",
                 "pages": [
-                  "guides/other/tutorials/build-a-saas-with-stack-auth",
+                  "guides/other/tutorials/build-a-saas-with-hexclave",
                   "guides/other/tutorials/build-a-team-based-app",
                   "guides/other/tutorials/ship-production-ready-auth"
                 ]

docs-mintlify/guides/other/tutorials/build-a-team-based-app.mdx

@@ -5,7 +5,7 @@ description: Model B2B tenants as teams, wire team selection and deep links, enf
 
 This tutorial walks through a **multi-tenant** product where a **team** is the customer boundary (workspace, organization, account). You get membership-scoped team access, permission checks, team selection UX, and invitations.
 
-If you have not installed Stack yet (handler routes, `HexclaveProvider`, environment variables), start with [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-stack-auth), then continue here.
+If you have not installed Stack yet (handler routes, `HexclaveProvider`, environment variables), start with [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-hexclave), then continue here.
 
 ## What you will have at the end
 
@@ -17,7 +17,7 @@ If you have not installed Stack yet (handler routes, `HexclaveProvider`, environ
 
 ## Prerequisites
 
-- Hexclave installed as in [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-stack-auth) (Next.js App Router examples below assume `stackServerApp` in `stack/server.ts` and `@hexclave/next` in the app).
+- Hexclave installed as in [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-hexclave) (Next.js App Router examples below assume `stackServerApp` in `stack/server.ts` and `@hexclave/next` in the app).
 - A project in the [dashboard](https://app.hexclave.com/projects) where you can edit **Teams** and **Team permissions**.
 
 <Note>
@@ -356,7 +356,7 @@ Teams support `clientMetadata`, `serverMetadata`, and `clientReadOnlyMetadata` o
 
 | Topic | Guide |
 |--------|--------|
-| Auth bootstrap and route protection | [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-stack-auth) |
+| Auth bootstrap and route protection | [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-hexclave) |
 | Teams API reference | [Teams](/guides/apps/teams/overview) |
 | `SelectedTeamSwitcher` and URL strategies | [Team selection](/guides/apps/teams/team-selection) |
 | Permission modeling and nesting | [RBAC](/guides/apps/rbac/overview) |

docs-mintlify/guides/other/tutorials/ship-production-ready-auth.mdx

@@ -5,7 +5,7 @@ description: Lock down page and API access, handle secrets and environments, the
 
 Going live is not only “turning on production mode.” This guide focuses on **what must be true** so only signed-in users reach protected surfaces, **secrets stay server-only**, and Stack’s dev-friendly defaults are replaced with **your** domains, OAuth apps, and email.
 
-If you are still wiring Stack into your app, complete [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-stack-auth) first. For team RBAC before launch, see [Build a team-based app](/guides/other/tutorials/build-a-team-based-app).
+If you are still wiring Stack into your app, complete [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-hexclave) first. For team RBAC before launch, see [Build a team-based app](/guides/other/tutorials/build-a-team-based-app).
 
 ## What you will have at the end
 
@@ -153,7 +153,7 @@ If you consume Stack webhooks, **verify every payload** (for example with Svix a
 
 | Topic | Guide |
 |--------|--------|
-| First integration | [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-stack-auth) |
+| First integration | [Build a SaaS with Hexclave](/guides/other/tutorials/build-a-saas-with-hexclave) |
 | Page protection details | [User fundamentals](/guides/getting-started/user-fundamentals) |
 | Domains, OAuth, email, prod mode | [Launch checklist](/guides/apps/launch-checklist/overview) |
 | `HexclaveServerApp` and keys | [Stack App](/guides/going-further/stack-app) |