Two changes close the cross-tenant topic leak in /api/conversations/topics.
The route at routes/history_routes.py:478 used get_current_user, which
returns None when no auth middleware has set request.state.current_user
(loopback-bypass, AUTH_ENABLED=false, or any path that short-circuits the
middleware). It then forwarded owner=None to analyze_topics.
The helper at src/topic_analyzer.py:21 used an 'if owner:' short-circuit
in its owner filter, so the None owner took the no-filter path and the
helper silently aggregated topic frequencies and per-snippet session_id,
session_name, role, and snippet text across every user's sessions.
analyze_topics now returns an empty result when owner is falsy. The
inner short-circuit is removed because the filter is now strict by
construction. The route is switched to require_user, which raises 401
when auth_manager.is_configured is True and the caller is anonymous,
matching the pattern used by calendar_routes, skills_routes, and other
authenticated routes.
The test test_history_topics_owner_scope.py was rewritten to drive the
real route through FastAPI's TestClient with a stub AuthMiddleware that
mirrors the loopback-bypass branch, and now asserts a strict 401 from
the route and an empty result from the helper. The previous version of
the test accepted either a 200-with-empty-topics or a 401; the strict
assertion means a future regression that drops the require_user wrapper
or re-adds the inner short-circuit is caught immediately.
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