fix(interpreter): sandbox $$ to return 1 instead of host PID#464
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$$ was using std::process::id() which leaked the real OS PID. Now returns fixed value 1 to maintain sandbox isolation. Closes #425 https://claude.ai/code/session_01WZjYqxm5xMPAEe7FSHJkDy
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Summary
$$was leaking the real host process ID, which is a sandbox escape"1"as a safe sandboxed valueTest plan
test_dollar_dollar_no_host_pid_leakCloses #425