feat(provenance): ArtistService resolves images via artist_id

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_artist_service.py

@@ -82,3 +82,25 @@ async def test_paged_images(db):
 async def test_paged_images_unknown_slug_none(db):
     svc = ArtistService(db)
     assert await svc.images("ghost", cursor=None, limit=10) is None
+
+
+@pytest.mark.asyncio
+async def test_overview_and_images_include_artist_id_only(db):
+    # FC-2d-vii-c: a folder-style image has artist_id but no provenance.
+    a = Artist(name="Solo", slug="solo")
+    db.add(a)
+    await db.flush()
+    rec = ImageRecord(
+        path="/images/s/1.jpg", sha256="s" + "0" * 63,
+        size_bytes=1, mime="image/jpeg", width=1, height=1,
+        origin="imported_filesystem", integrity_status="unknown",
+        artist_id=a.id,
+    )
+    db.add(rec)
+    await db.flush()
+
+    svc = ArtistService(db)
+    ov = await svc.overview("solo")
+    assert ov["image_count"] == 1
+    page = await svc.images("solo", cursor=None, limit=10)
+    assert [i["id"] for i in page.images] == [rec.id]