refactor(adapter-vite): narrow the public build interface

[SisyphusZheng]

What changed

• refresh the Mastodon dogfood lockfile to the current five-package 0.41.0-alpha.15 graph
• reduce @openelement/adapter-vite from 14 exports to the documented root, nitro-mount, and cli/build interfaces
• remove the unused sitemap re-export from generated SSR entries so runtime bundles do not load the Vite adapter root
• synchronize package docs, migration notes, resolver generation, and the public-interface snapshot
• make export-files:check compare generated content instead of rejecting every legitimate PR diff

Why

The documented package surface and published export map had drifted apart. Internal plugin factories and individual build phases were still importable, leaving a shallow public interface. The generator check also treated any tracked change as stale, preventing intentional interface changes from passing CI.

Impact

This is an intentional Alpha breaking change. Consumers of removed adapter subpaths must import supported helpers from the package root or use the generated @openelement/create lifecycle. The five-package product topology is unchanged.

Validation

• frozen dependency install
• format, lint, typecheck, architecture, package graph, type safety, Deno API, signal seam, docs truth, package surface, interface snapshot, and generated export checks
• 846 Deno tests and coverage thresholds
• website SSG build and artifact truth
• npm pack dry-run, package artifacts, packed starter, Deno/Node consumers, third-party Web Components
• Nitro Node and Workers proofs
• Chromium: 146/146 E2E
• Firefox: 146/146 E2E
• WebKit: 35 tests completed in the combined run before it was stopped for abnormal duration; one page.goto() timeout was flaky and passed 1/1 when rerun alone

Remaining risk

The complete WebKit suite was not allowed to run to completion after 13.5 minutes because navigation became abnormally slow. The sole observed timeout reproduced as passing in isolation and did not exercise the changed package-interface path.

[github-actions]

APIError: Insufficient Balance

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