fix(interpreter): block internal variable namespace injection#445
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fix(interpreter): block internal variable namespace injection#445
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THREAT[TM-INJ-009]: User scripts could assign to internal marker
prefixes (_NAMEREF_, _READONLY_, _UPPER_, _LOWER_) to manipulate
interpreter behavior. Block user assignment in set_variable() and
filter internal markers from ${!prefix*} expansion.
Closes #407
https://claude.ai/code/session_01WZjYqxm5xMPAEe7FSHJkDy
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Summary
Test plan
Closes #407