ForgeFlow 0.10.6

Permanent Windows updater launch repair

ForgeFlow no longer launches hidden PowerShell update helpers with Node's defective Windows detached process mode.
Binary and source updater processes remain hidden, are explicitly unreferenced after their verified handshake, and continue independently when ForgeFlow closes.
A real Windows regression test now exercises the exact production Node spawn options instead of using a different process API.
Startup is still fail-closed: ForgeFlow remains open unless the request-scoped helper status reaches started.
Versions 0.10.4 and 0.10.5 need a one-time direct installation of 0.10.6 because their installed launcher cannot execute its own helper; updates after 0.10.6 use the repaired path.