chore(release): bump router to 0.22.0 - #1064

Bumps @rangojs/router to 0.22.0: ## Unreleased becomes ## 0.22.0 (2026-10-06) in packages/rangojs-router/CHANGELOG.md, and package.json gets the version. No code change.

Also adds two changelog entries that were missing: on-demand prerender itself (#640 merged without one; only the warming entry from #1063 mentioned it), and the one behavior change #640 made outside the feature (cache({ tags }) drops duplicate tags).

Minor: two new features.

What goes out

• On-demand prerender: Prerender(..., { onDemand }), createRouter({ prerender: { store, ttl, onRevalidate } }), the bound runner router.prerender({ env, ctx }) with .many() and .markStale(), createKVPrerenderStore, createMemoryPrerenderStore, plain get/set custom stores (feat(router): on-demand (ISR-style) prerender #640).
• router.prerender() warms any route before traffic, for shared cache stores; SegmentCacheStore.scope; origin on the runner binding (router.prerender() for every route: warm runtime caches before traffic, shared stores only (design) #1062, feat(router): router.prerender() warms any route before traffic #1063).
• A Prerender + ppr shell HIT hydrates with the handle values its ssr: false loaders pushed (Prerender + ppr: a settled push from an ssr: false loader is in the shell HTML but never reaches the client (hydration error on every HIT) #1057, fix(router): a Prerender + ppr shell HIT hydrates with its loader pushes (#1057) #1061).
• A slow deferred push from an ssr: false loader no longer stops the shell capture (PPR shell HIT: the shell bakes an empty element for a deferred handle push, so the page fails hydration on every hit #1035, fix(router): shell capture no longer waits for loader pushes its record leaves out (#1035) #1059).
• A superseded link click no longer follows its server redirect; client redirect loops stop at 20 hops (Back/Forward to an entry the server now redirects is not followed: "Unprocessable popstate response" and an error boundary #1047, fix(router): superseded push no longer follows a stale redirect; client redirect loops stop at 20 hops #1058).

Not validated on a deployed target

On-demand prerender and warming ran on miniflare, the Node preset and the unit and browser suites only; no deployed worker or Vercel project has exercised them. The same holds for per-app cache versions from 0.21.0 (#1043), which on-demand entries are keyed by.

Test plan

• pnpm run typecheck, pnpm run test:unit:all (router 7,859 unit, 561 RSC with 2 expected failures), pnpm run lint, pnpm run format
• Every PR in this release passed CI before it merged