Updates all tests to use new social.coves.community.post namespace and structured com.atproto.label.defs#selfLabels format. Changes: - Update test data to match new lexicon schema (author field, facets, etc) - Update integration tests to use SelfLabels{Values: []SelfLabel{...}} - Update vote_repo_test to use new namespace - Update post creation tests for label validation - Update E2E tests for community post namespace All lexicon validation tests passing (64 pass, 2 skip for defs files). All integration tests passing with JSONB label storage.