/**
 * Entity property merge semantics, shared by both graph backends so they
 * cannot drift apart (file: storage/graph-store.ts, sqlite:
 * storage/sqlite/sqlite-stores.ts).
 *
 * Background: entity upsert merged properties with `{...existing, ...input}`,
 * so a repeated key was overwritten last-writer-wins. That is correct for most
 * properties but wrong for `scope`. The graph auto-populator stamps every file
 * and symbol entity with the scope of the decision that touched it
 * (engine/graph-auto-populator.ts), so a file touched by decisions in two
 * scopes ended up carrying only the most recent one — irrecoverably, and
 * rewriting the entity record every time it flipped.
 *
 * Measured on this repo before the fix: of 242 file entities carrying a scope,
 * only 132 had a name starting with that scope. The other 110 had been stamped
 * with an unrelated scope by a later decision.
 *
 * `scope` therefore accumulates as a sorted, deduplicated set. Sorting matters
 * for two reasons: it makes the stored bytes deterministic (no git churn from
 * ordering alone), and it makes the cap stable, so a hot entity converges
 * instead of oscillating.
 */
/** Split a stored set-valued property back into its members. */
export declare function splitSetProperty(value: string | undefined): string[];
/** Join members into the stored form, sorted, deduplicated, and capped. */
export declare function joinSetProperty(members: string[]): string;
/**
 * Merge incoming entity properties over existing ones. Ordinary keys overwrite
 * (last writer wins); keys in SET_VALUED_KEYS union into a sorted set.
 *
 * Backward compatible: an existing singular value like "src/auth/" is a valid
 * one-element set, and every consumer of `scope` does substring matching
 * (engine/context-assembler.ts getRelatedEntities and computeGraphReachability),
 * which still matches against a joined set.
 */
export declare function mergeEntityProperties(existing: Record<string, string> | undefined, incoming: Record<string, string> | undefined): Record<string, string>;
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