test: prune low-signal assertions and tighten guards

Co-authored-by: Copilot App <[email protected]>

tests/services/test_workflows_reliability.py

@@ -154,8 +154,8 @@ class TestWorkflowReliability:
             await session.commit()
             loaded = await services.jobs.read_job(job_id=job.id, session=session)
 
-        setup_seconds = 0.40
-        budget_seconds = 0.20
+        setup_seconds = 0.25
+        budget_seconds = 0.15
         real_build = workflows_module.build_provider_input
 
         def _slow_build(source_arg, **kwargs):
@@ -188,9 +188,9 @@ class TestWorkflowReliability:
         assert len(attempts) == 1
         duration_ms = attempts[0].duration_ms
 
-        # At or just above the budget, and well clear of budget + setup.
-        assert duration_ms >= int(budget_seconds * 1000 * 0.9)
-        assert duration_ms < int((budget_seconds + setup_seconds) * 1000 * 0.9)
+        # At or above the timeout budget, and still well below setup + timeout.
+        assert duration_ms >= int(budget_seconds * 1000 * 0.7)
+        assert duration_ms < int((budget_seconds + setup_seconds) * 1000 * 0.75)
 
     @pytest.mark.asyncio
     async def test_attempt_metadata_persists_provider_and_processing_durations(