Complete temporal detection safety gate

backend/app/core/request_context.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from contextvars import ContextVar, Token
+
+
+_request_id: ContextVar[str] = ContextVar("geointel_request_id", default="-")
+
+
+def get_request_id() -> str:
+    return _request_id.get()
+
+
+def set_request_id(value: str) -> Token:
+    return _request_id.set(value)
+
+
+def reset_request_id(token: Token) -> None:
+    _request_id.reset(token)