## What & why
The `HIDE_AUTH_BUTTONS` flag and its signed-link auth-override existed
only to gate registration/login behind a waitlist during the launch
period. That period is long over, so this removes the flag and the whole
waitlist apparatus. Registration and login are now always open, still
governed by `REGISTRATION_ENABLED` (Fortify's registration feature),
which is untouched.
## Removed
- **`HIDE_AUTH_BUTTONS`** config/env and
**`LandingAuthOverrideService`** — the signed-link override, override
cookie, and `?force=` bypass — plus its
`GenerateLandingAuthLinkCommand`.
- **Waitlist lead-capture + invitation apparatus**: `UserLeadController`
+ `waitlist.*`/`user-leads.*` routes, `StoreUserLeadRequest`, the
landing `WaitlistForm`, `waitlist/*` pages, waitlist/invitation mails,
invitation & re-invitation commands, the lead verification notification,
`LeadCohort`/`LeadCohortResolver`/`LeadPromoCodeAllocator`, and the
lead→Resend segment sync (scheduled tasks removed too).
- Frontend `hideAuthButtons`/`forcedRegistration` threading and the
`?force=` query on auth links (header, welcome, register, login).
- All tests for the removed features; `landing.hide_auth_buttons` config
stubs stripped from surviving tests.
## Kept on purpose (data preservation)
The `user_leads` **table, its migrations, and a lean `UserLead` model
are retained** — no destructive migration. Pre-launch contacts are not
lost, and new signups whose email matches a preserved lead still receive
that lead's promo code at Stripe checkout
(`SubscriptionController::resolveLeadPromotionCodeId`, unchanged).
## Testing
- Full non-Browser Pest suite green locally (**1948 passed**), plus
Pint, Prettier, ESLint.
- Browser QA (Playwright) on the running app: landing no longer shows
the waitlist form and renders the register/login CTAs; `/register`
renders the form (previously returned null when hidden); `/login` shows
the "Sign up" link pointing to `/register` with no `?force`. 16/16
functional checks passed; only pre-existing external-resource 404s in
console (gravatar `d=404`, `via.placeholder.com` seed images).
## Demo
https://github.com/user-attachments/assets/18a70f6d-b82f-4d92-b9de-da2610dc017a
a5117aaae6