fix: use checked_shl in LinePoly::deserialize #1492
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Replaced the unchecked left shift in LinePoly::deserialize (stwo_cairo_prover/crates/cairo-serialize/src/deserialize.rs) with checked_shl to prevent a runtime shift panic when log_size is oversized. The serializer guarantees valid log_size for well-formed inputs, but deserialization can receive malformed or adversarial data; this change keeps the existing panic-on-invalid policy while making the failure deterministic and explicit for invalid log_size without invoking an undefined shift.
This change is