R7: select Phase-B sandbox and freeze corpus protocol

[yava-code]

Outcome

Selects a digest-pinned Docker Desktop/WSL2 Phase-B backend and freezes the 30-patch R7 sampling/analysis protocol before any compiler outcome is inspected.

Windows evidence

A real disposable probe verified network-none, read-only root, zero undeclared mounts, read-only unchanged oracle, memory/CPU/PID limits, dropped capabilities, no-new-privileges, container-tree kill, and exact removal.

Boundary

This PR does not implement SandboxRunner, collect corpus patches, execute arbitrary code, or claim R7 success. Host execution remains forbidden.

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[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.