feat(website): show Hub's Free and Pro plans, and drop trial wording (#5138)

Hosted Hub replaces its automatic trial with a real Free plan, so the
pricing section becomes three columns: Self-hosted, Free, and Pro. Both
hosted columns render entirely from `GET /api/billing/plans` — name,
price, the `included` figures, and the catalog's feature prose — because
those figures are derived from the entitlement template the instance
enforces, so nothing on this page can drift from the limit a customer
actually gets.

The parser requires both slugs and the new `included` object and throws
on anything else. The page already degrades to "temporarily unavailable"
when the loader throws, so a strict boundary costs a fallback we have
rather than a wrong number we would ship. This is also why the change
must not merge before the Hub side deploys: against today's API the
section renders that fallback.

Public docs follow the two Hub changes: Free replaces the trial and
points at /hub for the figures Stripe metadata now owns; sign-in lands on
Home with its four-step checklist; `hub.execute` gets the grant command
it needs; and trigger authoring documents that the agent is validated
against the target daemon at save, which needs that daemon connected and
accepts Claude, Codex, and OpenCode only.

.github/workflows/ci.yml

@@ -120,6 +120,9 @@ jobs:
       - name: Typecheck all packages
         run: npm run typecheck
 
+      - name: Run website tests
+        run: npx vitest run packages/website/src --bail=1
+
       - name: Install website test browsers
         run: npx playwright install --with-deps chromium webkit