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Removing <bitlogin-auth> from the DOM terminates its crypto worker. A host that re-renders surrounding markup (framework diff, htmx swap, innerHTML reset) can do this incidentally, after which signing calls fail -- and the failure was hard to diagnose. Two guardrails: - disconnectedCallback logs a console.error when the element is removed while a session (BitLogin account or NIP-07/46) is active, naming the unmount as the cause and pointing at the README "Integration gotcha". - WorkerClient.terminate(reason) records the reason; both in-flight calls (via failAll) and any later call (via the dead-flag path) reject with it, so an unmounted widget produces one legible error message instead of a bare or mismatched one. The dead flag already prevented the infinite hang; this makes the cause visible and unifies the wording. Adds worker/workerClient.test.ts (fake Worker) covering both rejection paths. Updates the README gotcha paragraphs from "hangs forever with no error" to the new loud-rejection behavior. Addresses the "unmount guardrail" item of the Tessera integration feedback (docs/TODO.md). Co-Authored-By: Claude Opus 4.8 <[email protected]> Claude-Session: https://claude.ai/code/session_01BXQCvJPA6sVSQ5j8uBd9bB