fix(lint): remove broken step file and fix line-length violation

- Removed features/steps/plan_status_json_envelope_steps.py which contained
  invalid Python syntax (dummy content, not referenced by any feature)
- Fixed line-length violation in execute_phase_context_assembler.py
  (CoreContextBudget constructor call exceeded 88-char limit)

features/steps/plan_status_json_envelope_steps.py

@@ -1,2 +0,0 @@
-test line
-xxxxxxxxxx

src/cleveragents/application/services/execute_phase_context_assembler.py

@@ -298,7 +298,9 @@ class ACMSExecutePhaseContextAssembler(ExecutePhaseContextAssembler):
         # use the maximum so all projects can contribute within their biggest budget.
         effective_hot_max_tokens = self._resolve_hot_max_tokens(project_names)
 
-        budget = CoreContextBudget(max_tokens=effective_hot_max_tokens, reserved_tokens=0)
+        budget = CoreContextBudget(
+            max_tokens=effective_hot_max_tokens, reserved_tokens=0
+        )
         request = ContextRequest(
             query=(
                 f"Execute-phase context for plan {plan.identity.plan_id} "