ci(probe): widened ESP Windows job on plain main (do not merge)

[adamgell]

Probe for the PR #460 STATUS_ENTRYPOINT_NOT_FOUND failure: main + only the widened ESP Windows steps from #460. If the ESP job here fails the same way, the widened job itself is the trigger and #460's code is exonerated. Will be closed after one CI cycle.

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[adamgell]

Probe complete: reproduced the four sccm_client_management_fixture_contract path-separator failures on plain main + widened job, confirming the latent Windows bug lives on main (fix rides PR #460 as commit 46e7a6a). The app_lib loader question was answered separately by a dumpbin diagnostic on the #460 branch; the target-dir isolation fix is on that branch.