chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/agent/src/search/index.ts

@@ -0,0 +1,27 @@
+export interface SearchQuery {
+	text: string;
+	limit?: number;
+}
+
+export interface SessionSearchHit {
+	sessionId: string;
+	score?: number;
+	top?: { entryId: string; snippet?: string; timestamp: number };
+}
+
+export interface EntrySearchHit {
+	sessionId: string;
+	entryId: string;
+	timestamp: number;
+	snippet?: string;
+	score?: number;
+}
+
+export interface SessionSearchService {
+	searchSessions(query: SearchQuery): Promise<SessionSearchHit[]>;
+	searchEntries?(query: SearchQuery): Promise<EntrySearchHit[]>;
+	sync(): Promise<void>;
+	notify(sessionId: string): void;
+	remove(sessionId: string): Promise<void>;
+	close(): Promise<void>;
+}