/**
 * Structural-equivalence tests for the provenance graph contracts.
 *
 * These tests pin the literal shapes of the 16 provenance/release/BRAIN
 * unions promoted in Phase 0c (T9955) so that accidental narrowing or
 * widening produces a compile-time failure during `tsc -b` in the CI gate.
 *
 * The compile-time assertions use the conditional-equality trick
 * (`Equals<A, B>`) so any structural drift produces a TS2322 or TS2344 at
 * build time. The runtime `expect` shape sanity check below is a thin
 * smoke verification that representative literals satisfy each union — it
 * does NOT exercise behavior (these are pure type contracts with no
 * runtime).
 *
 * @since SG-ARCH-SOLID Saga T9831 · E-CONTRACTS-FOUNDATION T9832 · T9955 (Phase 0c)
 */
export {};
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