The harness asserted the driver still throws 'not implemented yet' for
the desktop-installer@latest update route; that arm is implemented now
(Invoke-PhaseInstallGui -Mode "update"), so the check failed against
its own tree. It asserts the implemented contract instead.
The 256-job cap wording in the workflow comment and README now states
the scope GitHub applies it at: each per-OS matrix separately, not the
combined leg count. At the 10-tag bound the largest matrix is windows
at 180.
e2e-screen-record comment: hhttps -> https.
49a5c440c5