mii-testdata-contribution

Guide for contributing test data to the MII (Medizininformatik-Initiative) testdata repository. Use when adding new module test data, understanding testdata repository patterns, creating transaction bundles, or adapting existing module examples for the testdata repo. Triggers on requests like "add testdata for module X", "create test bundle", "contribute to mii-testdata", or "adapt examples for testdata repo".