Securexe Launcher v0.1.14

Tell the worker when a device unlinks, not just locally

unlink previously only cleared ~/.securexe/account.json — the worker never
learned the device disconnected, so it kept showing up as linked on the
website forever. Now unlink calls the worker first (while the device token
is still in hand) and clears local state regardless of whether that call
succeeds.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>