/**
 * Round-trip Zod parse tests for `Attachment` variants, `AttachmentMetadata`,
 * and `AttachmentRef`.
 *
 * Each test constructs a valid input object for one schema variant, parses it
 * through the corresponding Zod schema, and asserts the parsed output matches
 * the input shape exactly. This guarantees schemas accept all valid shapes
 * without transformation loss.
 *
 * Coverage: 5 variants × 2 cases (minimal + full) = 10 round-trip tests,
 * plus invalid-input rejection tests for each variant, and metadata/ref tests.
 *
 * @epic T760
 * @task T795
 */
export {};
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