9aff1ea098
The hardened PowerShell retry loop from 2c2efd8 passed -ConnectionTimeout
and -OperationTimeout to Invoke-WebRequest. Those are PowerShell 7+ only;
GitHub Actions Windows runners ship PowerShell 5.1, which rejected them
with 'ParentContainsErrorRecordException / NamedParameterNotFound' on
the first iteration of the loop, and the catch block silently counted
the syntax error as a 'failed attempt' instead of a script bug.
Result on run #28689210122: both Windows jobs (build-windows-qt,
build-windows-daemon) failed at 'Download Tor' / 'Bundle Tor for daemon'
with exit code 1 before any HTTP traffic happened. macOS + Linux passed.
Fix:
* Drop -ConnectionTimeout and -OperationTimeout (PS7-only).
* Restructure the retry loop: explicit $downloaded flag, remove the
part-file on each attempt, throw explicitly at the end if all 3
attempts produced no usable file. The size check (>1MB) still
rejects 0-byte / truncated '200 OK' responses.
* Add a comment at the top of each step explaining the PS 5.1 limitation
so the next agent doesn't re-add the PS7 params.