fix(number/goldilocks): enforce canonicalization in from_str_radix #3470
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GoldilocksField::from_str_radix constructed with Self(n) and could store values ≥ ORDER, violating the invariant that values are always canonical. This led to potential incorrect behavior in arithmetic and formatting. The function now rejects values ≥ ORDER and constructs via from_canonical_u64. Added tests to assert rejection of ORDER and acceptance of ORDER−1 to lock in the behavior.