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* fix(cli): detach daemon from parent console on Windows CREATE_NEW_PROCESS_GROUP alone leaves the daemon attached to the parent console, so closing the launching cmd/PowerShell window fires CTRL_CLOSE_EVENT down the inherited console and takes the daemon with it. Add DETACHED_PROCESS so the child has no console at all; stdout/stderr are already redirected to the log file before spawn. * fix(cli): make `multica update` work while the binary is running on Windows On Windows, a running .exe is opened without FILE_SHARE_WRITE, so the previous os.Rename(tmp, exe) always failed with "Access is denied" — every `multica update` on Windows hit this, because the CLI is updating its own running binary. Windows does allow renaming the running .exe (just not overwriting it), so the new Windows-only replaceBinary moves the running binary to `.old` first, installs the new one, and restores the original if installation fails. A best-effort CleanupStaleUpdateArtifacts runs at CLI/daemon startup to reclaim the leftover `.old` file once the old process has exited. Unix keeps the plain rename-over semantics (the old inode stays valid for the running process). * fix(cli): stop daemon via HTTP /shutdown instead of console ctrl events With DETACHED_PROCESS the Windows daemon shares no console with the stop caller, so `GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, pid)` silently never reaches it — the old code would report "stop sent" while the daemon kept running. Replace the platform-specific stopDaemonProcess with a cross-platform POST to the daemon's HTTP /shutdown endpoint, which cancels the same top-level context the self-restart path already uses. Fall back to `process.Kill()` if the HTTP call fails. Also drops the now-unused stopDaemonProcess / CTRL_BREAK_EVENT wiring, adds handler tests, and updates the DETACHED_PROCESS comment.