fix(sdk): restore full public exports now session/document modules exist

index.ts re-exports document/session/history/persist-queue (trimmed in the
engine-layer PR to keep it self-contained); drops the temporary fallow
suppressions whose consumers now exist.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: vanceingalls

packages/sdk/src/adapters/types.ts

@@ -1,5 +1,3 @@
-// Consumed by session.ts + adapter implementations in the next stacked PR (#1325).
-// fallow-ignore-file unused-file
 import type { PersistErrorEvent } from "../types.js";
 
 // ─── PersistAdapter ───────────────────────────────────────────────────────────

packages/sdk/src/engine/patches.ts

@@ -105,8 +105,6 @@ export function pathToKey(path: string): string | null {
 
 // ─── Patch event builder ──────────────────────────────────────────────────────
 
-// Consumed by session.ts dispatch/batch in the next stacked PR (#1325).
-// fallow-ignore-next-line unused-export
 export function buildPatchEvent(
   forward: readonly JsonPatchOp[],
   inverse: readonly JsonPatchOp[],

packages/sdk/src/index.ts

@@ -17,3 +17,14 @@ export type {
 } from "./types.js";
 
 export { ORIGIN_APPLY_PATCHES, ORIGIN_LOCAL } from "./types.js";
+
+export { buildDocument, buildRoots, flatElements } from "./document.js";
+
+export { openComposition } from "./session.js";
+export type { OpenCompositionOptions } from "./session.js";
+
+export { createHistory } from "./history.js";
+export type { HistoryModule, HistoryOptions, HistoryEntry } from "./history.js";
+
+export { createPersistQueue } from "./persist-queue.js";
+export type { PersistQueueModule, PersistQueueOptions } from "./persist-queue.js";