fix(sandbox): give the sandbox venv system site packages #621

Job	Run time
No-Extra Install (uipath optional)	36s
Claude Code Plugin (manifests + offline scaffold)	20s
Evalboard (Types, Tests, Build)	2m 3s
Quality Gate (Format, Lint, Type, Test, Security)	5m 58s
E2E Smoke Tests (Real API)	6m 16s
Live Integration Tests (Settings Enforcement + Cost Budget)	1m 37s
Action Dogfood (composite action, real API)	28s
Windows Smoke Test	9m 31s
Live Integration Tests (Codex)	59s
Live Integration Tests (BYOA Plugin)	44s
	28m 32s

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