test: cover SharedWorker BFCache restoration - #487
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Summary
Extend the production SharedWorker lifecycle workflow with a same-origin history navigation that enters and restores from Chromium's back-forward cache. The workflow proves pagehide cleanup, the restored facade's disconnected state, marker-based non-receipt, and a usable fresh generation after explicit reconnect and room admission.
Run the lifecycle checks in headed Chromium under Xvfb because Playwright disables BFCache in its default launch configuration. Document that the page JavaScript instance survives restoration while callers remain responsible for reconnecting and restoring application admission state.
Related issue
Closes #484
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