feat(agent): provider/model/connection for agent harnesses - #4815

AssertionError: assert '428017e3-47f...-619622bdda25' == 'c348be04-364...-75bbbaa23761'
  
  - c348be04-364e-445a-987c-75bbbaa23761
  + 428017e3-47f4-4f48-b33a-619622bdda25
monkeypatch = <_pytest.monkeypatch.MonkeyPatch object at 0x7f34289824a0>

    @pytest.mark.asyncio
    async def test_get_default_workspace_id_prefers_owner_membership(monkeypatch):
        owner_workspace_id = uuid4()
        editor_workspace_id = uuid4()
    
        _patch_core_session(
            monkeypatch,
            [
                SimpleNamespace(
                    workspace_id=editor_workspace_id,
                    role="editor",
                    created_at=datetime(2026, 4, 9, tzinfo=timezone.utc),
                ),
                SimpleNamespace(
                    workspace_id=owner_workspace_id,
                    role="owner",
                    created_at=datetime(2026, 4, 10, tzinfo=timezone.utc),
                ),
            ],
        )
    
        workspace_id = await db_manager.get_default_workspace_id(str(uuid4()))
    
>       assert workspace_id == str(owner_workspace_id)
E       AssertionError: assert '428017e3-47f...-619622bdda25' == 'c348be04-364...-75bbbaa23761'
E         
E         - c348be04-364e-445a-987c-75bbbaa23761
E         + 428017e3-47f4-4f48-b33a-619622bdda25

oss/tests/pytest/unit/services/test_db_manager.py:80: AssertionError