feat(attachments): importer dispatch — archive extract + non-media capture

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

tests/test_importer_attachments.py

@@ -0,0 +1,61 @@
+"""FC-2d-iii: loose non-media → PostAttachment (no skip)."""
+
+import pytest
+from sqlalchemy import func, select
+
+from backend.app.models import Artist, ImportSettings, PostAttachment
+from backend.app.services.importer import Importer
+from backend.app.services.thumbnailer import Thumbnailer
+
+pytestmark = pytest.mark.integration
+
+
+@pytest.fixture
+def import_layout(tmp_path):
+    import_root = tmp_path / "import"
+    images_root = tmp_path / "images"
+    import_root.mkdir()
+    images_root.mkdir()
+    return import_root, images_root
+
+
+@pytest.fixture
+def importer(db_sync, import_layout):
+    import_root, images_root = import_layout
+    settings = db_sync.execute(
+        select(ImportSettings).where(ImportSettings.id == 1)
+    ).scalar_one()
+    return Importer(
+        session=db_sync, images_root=images_root, import_root=import_root,
+        thumbnailer=Thumbnailer(images_root=images_root), settings=settings,
+    )
+
+
+def test_loose_non_media_becomes_attachment(importer, import_layout):
+    import_root, _ = import_layout
+    f = import_root / "Alice" / "manifesto.pdf"
+    f.parent.mkdir(parents=True, exist_ok=True)
+    f.write_bytes(b"%PDF-1.4 stuff")
+    r = importer.import_one(f)
+    assert r.status == "attached"
+    att = importer.session.execute(select(PostAttachment)).scalar_one()
+    artist = importer.session.execute(
+        select(Artist).where(Artist.slug == "alice")
+    ).scalar_one()
+    assert att.artist_id == artist.id
+    assert att.post_id is None
+    assert att.original_filename == "manifesto.pdf"
+    assert att.ext == ".pdf"
+
+
+def test_json_sidecar_is_not_attached(importer, import_layout):
+    import_root, _ = import_layout
+    j = import_root / "Alice" / "x.json"
+    j.parent.mkdir(parents=True, exist_ok=True)
+    j.write_text("{}")
+    r = importer.import_one(j)
+    assert r.status == "skipped"
+    n = importer.session.execute(
+        select(func.count()).select_from(PostAttachment)
+    ).scalar_one()
+    assert n == 0