Replace exception-driven Variant encoding - #400
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Replaces Variant's exception-driven candidate probing with compatibility classification before encoding.
The classifier covers scalar values and recursively checks nullable, array, tuple, and map members while preserving canonical first-match behavior.
This removes exception overhead for integer-heavy variants and ensures real encoder errors are no longer hidden as type mismatches.
Validated with the full test suite (475 tests), focused regression coverage, formatting, and
git diff --check.