fix: add session lock in StockSelector, remove unused HEALTH_PORT_OFFSET, lint fixesHEADmaster

- Add asyncio.Lock to StockSelector._ensure_session() to prevent race condition
- Remove unused HEALTH_PORT_OFFSET constant from news-collector
- Auto-fix import sorting and formatting from ruff

1 files changed, 1 insertions, 3 deletions

diff --git a/shared/src/shared/events.py b/shared/src/shared/events.py
index 61b85bd..37217a0 100644
--- a/shared/src/shared/events.py
+++ b/shared/src/shared/events.py
@@ -100,6 +100,4 @@ class Event:
         try:
             return cls.from_raw(data)
         except KeyError as exc:
-            raise ValueError(
-                f"Missing required field in {event_type} event data: {exc}"
-            ) from exc
+            raise ValueError(f"Missing required field in {event_type} event data: {exc}") from exc