Local implementation verification

Verified on 2026-10-08 before consumer migration. The package remains private and unpublished; CI is configured, not claimed to have run on GitHub.

• TypeScript check and browser/server/Svelte package builds passed.
• Core/history and React/Vue SSR tests: 18 passed.
• Playwright desktop/mobile tests: 36 passed, covering retention, fresh reopen, guards, keyboard/IME, custom button events/refs, modal focus, RTL, CSS exclusion and DDS theme mapping; axe checks had no violations.
• npm run test:adapters: RetainedPanels native DOM 3 and SSR 3; Svelte adapter and fixture typechecks, SSR and native browser checks passed. The runner starts and closes its own server on an assigned port.
• Demo build passed.
• node scripts/verify-package.mjs: clean packed core-only installation without framework/Ark dependencies; selected React/Vue/Solid/Svelte installations and SSR; Solid Chromium hydration preserving DOM nodes and accessibility IDs; compiled packaged Svelte output. All passed.

The first actual FM Worker run exposed the Solid subpath selecting its browser build under Worker conditions. Explicit worker/workerd server exports were added, with packed conditional-resolution and retained-page server-rendering regressions. Both conditional checks passed; the FM Worker run is rechecked separately in its consumer QA record.

Reproduce with npm ci, install Playwright Chromium, then npm run verify and node scripts/verify-package.mjs. The CI runtime uses Node 24.15+ to satisfy development-tool engine requirements. Local checks ran on the existing Node 24.12 runtime; the jsdom engine warning was visible.

The synchronous history adapter is optional; asynchronous router loaders remain app-owned. Fixed screen registries are construction-time. Solid RetainedPanels supports an app-owned dynamic authorized list without adopting the library controller. Next.js, Nuxt and SvelteKit production integration and external publication have not been verified here.