chore(quality): apply ruff autofixes and formatting (223 fixes, regression-free: 118/118 tests pass)

tests/test_deals.py

@@ -37,6 +37,7 @@ async def test_update_deal_stage_creates_history(
 
     # Verify DealStageHistory row exists in DB
     from sqlalchemy import text
+
     async with session_factory() as session:
         result = await session.execute(
             text("SELECT to_stage FROM deal_stage_history WHERE deal_id = :did ORDER BY id"),
@@ -74,6 +75,7 @@ async def test_db_write_deal(
 ) -> None:
     """DB roundtrip: read back a seeded deal directly via SQL."""
     from sqlalchemy import text
+
     deal_id = seed_data["deal_ids"][2]
     async with session_factory() as session:
         result = await session.execute(