Fix failing tests for legacy auth and heartbeat

- Add agent_id parameter to legacy Bearer auth test (required by design)
- Add last_heartbeat to test_agent_with_secret fixture

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/conftest.py

@@ -9,7 +9,7 @@ import pytest
 import pytest_asyncio
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 
-from app.models.base import Base
+from app.models.base import Base, utc_now
 from app.models.tenant import Tenant
 from app.models.agent import Agent
 from app.models.registration_token import RegistrationToken
@@ -139,6 +139,7 @@ async def test_agent_with_secret(
         status="online",
         token="",  # Empty for new auth scheme
         secret_hash=secret_hash,
+        last_heartbeat=utc_now(),
     )
     db.add(agent)
     await db.commit()

tests/routes/test_agent_auth.py

@@ -109,6 +109,7 @@ class TestGetCurrentAgentCompat:
             x_agent_id=None,
             x_agent_secret=None,
             authorization=f"Bearer {test_agent_legacy.token}",
+            agent_id=test_agent_legacy.id,  # Legacy auth requires agent_id
         )
 
         assert result.id == test_agent_legacy.id