T01.i: remove dead ensureReposOpen (batch open-repo helper)

Its only callers were its own definition and its dedicated test block;
no production code used it since the read-union removal (T01.f). The
one test that exercised readDocumentSubjects' real integration path
(not ensureReposOpen itself) is kept, moved under the ensureRepoOpen
describe block it actually belongs to.

packages/polyfill/src/emulated-verifier/open-repo.ts

@@ -285,14 +285,3 @@ export async function openRepoUnguarded(nuri: Nuri): Promise<void> {
   inFlight.set(nuri, p);
   return p;
 }
-
-/**
- * Open a SET of repos before an anchored batch read, in parallel, each tolerant
- * ({@link ensureRepoOpen} never throws). Empty / falsy entries are ignored.
- */
-// @provenance ensureReposOpen kind=aligned level=2 ref=sdk/js/lib-wasm/src/lib.rs:doc_subscribe — the batch form, with per-doc isolation
-export async function ensureReposOpen(nuris: Nuri[]): Promise<void> {
-  const unique = [...new Set(nuris.filter(Boolean))];
-  if (unique.length === 0) return;
-  await Promise.all(unique.map((n) => ensureRepoOpen(n)));
-}

packages/polyfill/test/open-repo.test.ts

@@ -1,6 +1,5 @@
 /**
- * open-repo.test.ts — behavioral tests for ensureRepoOpen / ensureReposOpen
+ * open-repo.test.ts — behavioral tests for ensureRepoOpen (src/open-repo.ts).
- * (src/open-repo.ts).
  *
  * Core invariant: on a fresh session over a persistent wallet, a scope-index
  * or entity repo is NOT yet in `self.repos`, so an anchored sparql_query returns
@@ -21,7 +20,7 @@
  */
 
 import { describe, it, expect, mock, beforeEach, afterAll } from "bun:test";
-import { ensureRepoOpen, ensureReposOpen, resetOpenedRepos } from "../src/emulated-verifier/open-repo";
+import { ensureRepoOpen, resetOpenedRepos } from "../src/emulated-verifier/open-repo";
 import { readDocumentSubjects } from "../src/surface/read-document";
 import { configure } from "../src/index";
 import { configureStoreRegistry, setCurrentUser } from "../src/shared-wallet/bootstrap";
@@ -168,43 +167,6 @@ describe("ensureRepoOpen", () => {
     // Calling again should also be a no-op (idempotent, already in opened)
     await expect(ensureRepoOpen("did:ng:o:c")).resolves.toBeUndefined();
   });
-});
-
-describe("ensureReposOpen", () => {
-  it("opens all provided nuris in parallel (one subscribe per unique nuri)", async () => {
-    const ng = makeFakeNgWithSubscribe({
-      "did:ng:o:x": [[TYPE, `${FP}Event`]],
-      "did:ng:o:y": [[TYPE, `${FP}Event`]],
-    });
-    inject(ng);
-
-    await ensureReposOpen(["did:ng:o:x", "did:ng:o:y"]);
-
-    expect(ng.doc_subscribe).toHaveBeenCalledTimes(2);
-    expect(ng.subscribed.has("did:ng:o:x")).toBe(true);
-    expect(ng.subscribed.has("did:ng:o:y")).toBe(true);
-  });
-
-  it("deduplicates: repeated nuri in input leads to exactly one subscribe", async () => {
-    const ng = makeFakeNgWithSubscribe({
-      "did:ng:o:dup": [[TYPE, `${FP}Event`]],
-    });
-    inject(ng);
-
-    await ensureReposOpen(["did:ng:o:dup", "did:ng:o:dup", "did:ng:o:dup"]);
-
-    expect(ng.doc_subscribe).toHaveBeenCalledTimes(1);
-  });
-
-  it("empty or all-falsy input is a no-op (no subscribe calls)", async () => {
-    const ng = makeFakeNgWithSubscribe({});
-    inject(ng);
-
-    await ensureReposOpen([]);
-    await ensureReposOpen(["" as any]);
-
-    expect(ng.doc_subscribe).toHaveBeenCalledTimes(0);
-  });
 
   it("the anchored document read triggers doc_subscribe then returns data (integration path)", async () => {
     const ng = makeFakeNgWithSubscribe({