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§3.2 — Performance: Implement 7-Zip compression for artifacts with fallback to Compress-Archive for compatibility. Three call sites updated: 1. Host-side source compression: new Compress-BuildArtifact helper function 2. Guest-side custom build artifacts: inline 7-Zip check in scriptblock 3. Guest-side dotnet build output: inline 7-Zip check in scriptblock Uses 7z.exe with -mmt=on (multi-threaded) and -mx1 (fast, low ratio impact). Falls back to Compress-Archive if 7-Zip not found (until §6.6 template update). Expected 10-20s speedup per build once 7-Zip installed in template. Also defer all security items (§1.2/1.3/1.5/1.7/1.8) to home-lab section since environment is isolated and excessive for current use case. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>