fix(FN-4966): repair core exports and updateTask patch typing

Fusion-Task-Id: FN-4966
Fusion-Task-Lineage: 8f5ea300-feaa-469c-aeed-f7304a5a1b6d

packages/core/src/index.ts

@@ -148,6 +148,7 @@ export {
   type SameAgentDuplicateCandidate,
   type SameAgentDuplicateMatch,
 } from "./duplicate-intake.js";
+export { getTaskDuplicateLineage } from "./duplicate-lineage.js";
 export { computeRetrySummary, RETRY_STORM_WARNING_RATIO } from "./retry-summary.js";
 export { RetryStormError, serializeRetryStormError } from "./retry-storm-error.js";
 export { aggregateAgentTokenUsage } from "./agent-token-usage.js";