Consolidate Odysseus agent harness and tool contracts

tests/test_task_scheduler_fixture_isolation.py

@@ -0,0 +1,11 @@
+from src.task_scheduler import _is_sft_fixture_owner
+
+
+def test_sft_accounts_are_background_scheduler_fixtures():
+    assert _is_sft_fixture_owner("sft_alex_creator")
+    assert _is_sft_fixture_owner("SFT_MAYA_OPS")
+
+
+def test_real_and_ownerless_accounts_remain_scheduler_eligible():
+    assert not _is_sft_fixture_owner("pewds")
+    assert not _is_sft_fixture_owner(None)