feat(core,server): log feed, titles on changes, work titles on copies

GET log (engagements and listens, keyset over at/kind/id), listChanges
title and intoTitle, listCopies workTitle, all via batched lookups.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/core/test/copies.test.ts

@@ -2,6 +2,7 @@ import { expect, test } from "bun:test";
 import { forEachDialect } from "@sttracker/db/testing";
 import { createCopy, listCopies, softDeleteCopy, updateCopy } from "../src/copies.ts";
 import { defineCustomField } from "../src/custom-fields.ts";
+import { upsertEntry } from "../src/entries.ts";
 import { NotFoundError, ValidationError } from "../src/errors.ts";
 import { getHistory, restoreVersion } from "../src/history.ts";
 import { makeUser, makeWork } from "./user-layer-fixtures.ts";
@@ -73,4 +74,23 @@ forEachDialect("copies", (getDb) => {
       NotFoundError,
     );
   });
+
+  test("listCopies carries the work title, with the user's title override", async () => {
+    const db = getDb();
+    const userId = await makeUser(db);
+    const dune = await makeWork(db, { title: "Dune" });
+    const hyperion = await makeWork(db, { title: "Hyperion" });
+    await upsertEntry(db, userId, dune, { overrides: { title: "Dune (1965)" } }, "user");
+    const a = await createCopy(db, userId, { workId: dune });
+    const b = await createCopy(db, userId, { workId: hyperion });
+    const c = await createCopy(db, userId, { titleHint: "HALF-LIFE 2" });
+    const byId = new Map((await listCopies(db, userId)).map((x) => [x.id, x]));
+    expect(byId.get(a.id)!.workTitle).toBe("Dune (1965)");
+    expect(byId.get(b.id)!.workTitle).toBe("Hyperion");
+    expect(byId.get(c.id)!.workTitle).toBeNull();
+    // Another user's override does not leak.
+    const bob = await makeUser(db, "bob");
+    await createCopy(db, bob, { workId: dune });
+    expect((await listCopies(db, bob))[0]!.workTitle).toBe("Dune");
+  });
 });