/**
 * ADR-121 Phase 18 — Witness ledger (chain) tests.
 *
 * Covers:
 *  - Empty ledger verifies as valid (zero entries, zero failures)
 *  - Single-entry chain (genesis with prevContentHash=null)
 *  - Multi-entry chain — sequence + prev-hash linkage
 *  - Tamper detection at every position (genesis, middle, tail)
 *  - Sequence mismatch detection
 *  - Wrong version rejected
 *  - Verification result reports the FIRST failure position
 *  - Same signer key carries across appends
 */
export {};
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