CONV-037: Create ConverterRegistry skeleton

[menvil]

Skeleton ConverterRegistry accepting explicit list of Converter instances. Lookup methods land in CONV-039.

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Summary by cubic

Add a minimal ConverterRegistry that accepts an explicit list of Converter instances, establishing the foundation for converter lookup per CONV-037. Includes a unit test for instantiation; lookup methods will be added in CONV-039.

^{Written for commit a881909. Summary will update on new commits.}

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