CONV-039: Implement registry lookup methods

[menvil]

Implements all/forSource/find/targetsFor on ConverterRegistry with FileFormat normalization.

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Summary by cubic

Implements lookup methods in ConverterRegistry to list and find converters, with FileFormat normalization for consistent matching. Addresses Linear CONV-039 by enabling reliable source/target queries.

• New Features
  • all(): returns all registered converters.
  • forSource(source): normalizes source and filters converters by source format.
  • find(source, target): normalizes formats and returns the matching converter or null.
  • targetsFor(source): returns ConverterTarget entries for a normalized source (with recommended: false).

^{Written for commit 7aa00e7. Summary will update on new commits.}

Review in cubic

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