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Step 12 in Setup-WinBuild2025.ps1 installs all 8 Tier-2 tools: - PowerShell 7.4.7 LTS (pwsh.exe) - NSIS 3.10 (makensis.exe) - CMake 3.31.6 (cmake.exe) - Node.js 22.14.0 LTS (node.exe + npm) - WiX 4.0.5 via dotnet tool (wix.exe, C:\BuildTools\Wix\) - GitHub CLI 2.67.0 (gh.exe) - Sysinternals Suite (C:\BuildTools\Sysinternals\, extracted via 7-Zip) - vcpkg HEAD shallow clone + bootstrap (C:\BuildTools\vcpkg\) All tools added to Machine PATH; idempotent (binary-presence check). Hash entries in \ ready for SHA256 pinning. knownTempFiles extended; Final gate Assert-Step added for all 8 binaries. Prepare-WinBuild2025.ps1: 7 new params + pass-through to Setup. Validate-SetupState.ps1: Tier-2 checks in both main + re-run scriptblocks. TODO.md: §6.6 [~] -> [x], Sprint 11 summary.