style: apply ruff format across the repository

ruff format was never run repo-wide; CI now enforces 'ruff format --check', so normalize every module once. No behavior changes.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_sprint4_ezdxf.py

@@ -21,6 +21,7 @@ pytestmark = pytest.mark.asyncio
 
 # ── R24 — CENTER/HIDDEN linetype actually loaded + applied ──────────────────
 
+
 async def test_create_line_loads_center_linetype(backend):
     # Fresh doc: CENTER is not loaded yet.
     assert "CENTER" not in backend._doc.linetypes
@@ -53,6 +54,7 @@ async def test_create_line_continuous_does_not_error(backend):
 
 # ── S3 — block description surfaced from the definition ─────────────────────
 
+
 async def test_block_list_surfaces_description(backend):
     # Create a block from an entity, then stamp a description on its definition.
     seg = await backend.entity_create_line(0, 0, 10, 0)
@@ -76,6 +78,7 @@ async def test_block_list_description_defaults_empty(backend):
 
 # ── R26 / N9 — honest zoom payload shape ────────────────────────────────────
 
+
 async def test_zoom_extents_reports_not_applied(backend):
     res = await backend.view_zoom_extents()
     assert res["ok"] is True
@@ -92,6 +95,7 @@ async def test_zoom_window_reports_not_applied(backend):
 
 # ── NEW-undo-1 — undo/transaction stack behaviour under lock ────────────────
 
+
 async def test_undo_empty_stack_returns_error(backend):
     res = await backend.drawing_undo()
     assert res["ok"] is False