/**
 * EvidenceRecord discriminated union — typed proof artifacts produced by IVTR agents.
 *
 * Each variant represents a specific kind of evidence that an IVTR-phase agent
 * (implement, validate, test) can emit. All variants share a common set of
 * provenance fields (`agentIdentity`, `attachmentSha256`, `ranAt`, `durationMs`)
 * so that evidence rows can be queried, correlated, and archived uniformly.
 *
 * Five kinds are defined:
 * - `impl-diff`         — a code change produced by an implement-phase agent
 * - `validate-spec-check` — a spec-requirements check by a validate-phase agent
 * - `test-output`       — the output of a test command run by a test-phase agent
 * - `lint-report`       — a static-analysis run (biome, tsc, etc.)
 * - `command-output`    — a generic CLI command invocation with exit code
 *
 * @epic T810
 * @task T816
 * @see {@link EvidenceRecordKind} for all discriminant values
 */
export {};
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