docs(gr1cs): correct InternedField representation; remove misleading 64-bit bit layout #418
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…64-bit bit layout
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The docstring above InternedField incorrectly described a 64-bit bit-packed layout with tag bits, inline small constants (two’s complement), and a “coefficient pool index.” In reality, InternedField is a u32 opaque handle with special cases: 0 => F::ONE, 1 => -F::ONE, and >=2 indexing into FieldInterner::vec. No bit tagging or inline-constant encoding is implemented anywhere in the codebase. Updated the documentation to reflect the actual design to prevent developer confusion.