CONV-038: Test registry lists converters by source

[menvil]

Adds failing tests for ConverterRegistry lookup methods (all/forSource/find/targetsFor). Implementation in CONV-039.

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Summary by cubic

Adds failing unit tests that define expected behavior for ConverterRegistry: listing all converters, filtering by source, finding exact source–target pairs, and returning target cards. Aligns with Linear CONV-038 by verifying the registry lists converters by source; implementation will land in CONV-039.

^{Written for commit 39c3494. Summary will update on new commits.}

Review in cubic

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