[beta.2.2] Prove Native and Lit Framework Mode end-to-end

[SisyphusZheng]

Part of #1321; depends on #1320 and shared Document #1326. Standalone Element baseline proof is #1338; cumulative consumer qualification is #1333/#1340.

Paired application acceptance

• Equivalent Native/Lit list/detail/form/validation/success/error applications use file-generated records and one application protocol.
• Loader -> SSR -> native claim or Lit hydration -> navigation -> action -> data refresh, plus redirect/404/errors.
• Native POST progressive fallback with JS disabled; application-owned enhancement preserves method/body/status/headers.
• Abort/newer-wins, back/forward, page exit/re-entry/remount and cleanup work in admitted browsers.
• Hono executes selected handlers without rematching; layouts/Document do not add data schedulers.
• Separate SSR and SSG; private request data never enters static public artifacts.
• Router owns shared outcomes/context semantics; Native compiler/artifact protocol is absent from Lit runtime.
• Explicit rendering selection; no universal hydration/DSD/CEM inference.
• Qualify Lit reference runtime and publish unsupported/unverified cells; keep Native Cloudflare/Node/Deno and Bun/Nitro scope.
• Packed consumer installs/develops/builds/runs without workspace aliases or routine framework edits.
• Retain UI focus/keyboard/reconnect and foreign CE host binding evidence where used; no UI expansion.

Derive minimal interfaces from working implementations; do not freeze a speculative FrameworkAdapter. Use fixtures or independent consumers, not examples/**.

Governing plan (2026-09-08)

Maintainer-approved: ADR-0152, docs/current/VERSION_PLAN.md and #1341. Execution: https://github.com/orgs/open-element/projects/3. Acceptance checkpoints replace the three-day schedule. No automatic beta.2.4. Native/Lit are formal Framework Mode targets, not already-shipped support. Existing release records/versions remain unchanged; no closure without final-SHA evidence. examples/** stays frozen.

Accepted upstream-contribution priority — 2026-09-08

Native/Lit paired flows use upstream-aligned WTR component conformance while real SSR/navigation/POST remains in Playwright E2E. Separate generic Lit/WTR defects into recipient-native small reproductions and proposed patches; keep OE application protocol defects local. No upstream merge/timing gate or two complete SaaS requirement.

Use docs/architecture/infrastructure-reduction.md and VERSION_PLAN as scope. Prepare useful generic fixes for contribution through normal authorization; no invented bugs, cosmetic PR quota, or upstream-response release dependency. No migration is completed by this update.