merge master: reconcile the two direct install.sh hotfixes

Both were emergency live-fixes to master (since install.sh/install.ps1 are
curl'd straight from that branch's raw URL, bypassing the normal release
promotion): the `ostp setup` subcommand fix and the alpha/beta self-update
mechanism fix. alpha already has equivalent content for both via its own
separate commits, so this is a pure reconciliation.
This commit is contained in:
ospab 2026-07-21 18:42:00 +03:00
commit e7a4f2b4a4

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