/**
 * Unit + snapshot tests for the Docs Provenance Graph contract (T10166).
 *
 * Coverage:
 *   - Round-trip Zod parse for each node variant + edge variant + envelope.
 *   - Discriminator rejection for unknown `kind` / `relation` / lifecycle values.
 *   - Type-guard narrowing for all five node variants.
 *   - Snapshot test for a typical-sized graph (5 docs, 8 tasks, 4 decisions,
 *     2 sessions) — locks the wire shape consumed by the renderer.
 *
 * @task T10166
 */
export {};
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