fix: isolate Python example evaluation in Docker - #19
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The Python example now executes candidate pytest code only inside a restricted Docker container instead of a host subprocess. Require a pre-provisioned trusted image and preflight before model calls; use staged read-only inputs, no network, non-root execution, resource/output limits, and confirmed cleanup. Infrastructure failures abort both loops without a host fallback.
Validation: a fresh independent reviewer approved the final commit and reproduced all 14 synthetic container tests. The combined local suite passed 235 tests with six optional framework integrations skipped; CI is pending. The image was prepared offline from cached trusted Python and pytest packages. No model calls or research runs were performed. Docker/kernel trust and research comparability remain outside this proof.