Generate the desktop client_id deterministically from OS machine identifiers
(IOPlatformUUID / MachineGuid / /etc/machine-id) scoped per
tenant+workspace+user, with a persisted UUID fallback when the OS lookup
fails. The renderer now requests the id over a new IPC bridge instead of
keeping a localStorage UUID, so reinstalls and storage clears no longer
fork into duplicate clients. Server enforces the id as required and
rejects empty/malformed UUIDs. Also harden bootstrap reveal flow and
single-instance exit so a second launch focuses the existing window.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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