fix(acms): fix ruff format violations and deduplicate CHANGELOG entry

- Apply ruff format to features/steps/acms_budget_enforcement_steps.py
- Apply ruff format to robot/helper_acms_budget_enforcement.py
- Remove 3 duplicate ACMS Budget Enforcement entries from CHANGELOG.md

Resolves CI lint failure (ruff format --check) on PR #9673

CHANGELOG.md

@@ -23,27 +23,6 @@ The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
   defensive copy returns, `__post_init__` cross-validation, and byte-accurate UTF-8
   size measurement.
 
-- **ACMS Budget Enforcement** (#9583): Introduced `BudgetEnforcer`, `BudgetViolation`,
-  and `ContextFile` components enforcing per-file (`max_file_size`) and cumulative
-  (`max_total_size`) size constraints on assembled context. Files exceeding limits are
-  excluded with clear, actionable violation messages. Includes argument validation,
-  defensive copy returns, `__post_init__` cross-validation, and byte-accurate UTF-8
-  size measurement.
-
-- **ACMS Budget Enforcement** (#9583): Introduced `BudgetEnforcer`, `BudgetViolation`,
-  and `ContextFile` components enforcing per-file (`max_file_size`) and cumulative
-  (`max_total_size`) size constraints on assembled context. Files exceeding limits are
-  excluded with clear, actionable violation messages. Includes argument validation,
-  defensive copy returns, `__post_init__` cross-validation, and byte-accurate UTF-8
-  size measurement.
-
-- **ACMS Budget Enforcement** (#9583): Introduced `BudgetEnforcer`, `BudgetViolation`,
-  and `ContextFile` components enforcing per-file (`max_file_size`) and cumulative
-  (`max_total_size`) size constraints on assembled context. Files exceeding limits are
-  excluded with clear, actionable violation messages. Includes argument validation,
-  defensive copy returns, `__post_init__` cross-validation, and byte-accurate UTF-8
-  size measurement.
-
 - Wired `StrategyActor` into the real plan execution path: `_get_plan_executor`
   in `plan.py` now resolves the strategy actor via `resolve_strategy_actor()`
   (reading the `actor.default.strategy` config key) instead of always

features/steps/acms_budget_enforcement_steps.py

@@ -128,9 +128,7 @@ def step_total_size_should_be(context, size: int) -> None:
 def step_total_size_should_not_exceed(context, size: int) -> None:
     """Verify the total context size does not exceed limit."""
     actual_size = context.budget_enforcer.get_total_size()
-    assert (
-        actual_size <= size
-    ), f"Total size {actual_size} exceeds limit {size}"
+    assert actual_size <= size, f"Total size {actual_size} exceeds limit {size}"
 
 
 @then("a budget violation warning should be generated for the file")
@@ -140,18 +138,14 @@ def step_budget_violation_warning_generated(context) -> None:
     assert len(violations) > 0, "No budget violations were recorded"
 
 
-@then(
-    "a budget violation warning should be generated for exceeding max_total_size"
-)
+@then("a budget violation warning should be generated for exceeding max_total_size")
 def step_budget_violation_for_total_size(context) -> None:
     """Verify that a budget violation for max_total_size was generated."""
     violations = context.budget_enforcer.get_violations()
     total_size_violations = [
         v for v in violations if v.violation_type == "max_total_size"
     ]
-    assert (
-        len(total_size_violations) > 0
-    ), "No max_total_size violations were recorded"
+    assert len(total_size_violations) > 0, "No max_total_size violations were recorded"
 
 
 @then("a budget violation error should be generated")
@@ -239,9 +233,7 @@ def step_violation_includes_limit(context, limit: int) -> None:
     violations = context.budget_enforcer.get_violations()
     assert len(violations) > 0, "No violations found"
     violation = violations[-1]
-    assert violation.limit == limit, (
-        f"Expected limit {limit}, got {violation.limit}"
-    )
+    assert violation.limit == limit, f"Expected limit {limit}, got {violation.limit}"
 
 
 @then("both files should be included in the assembled context")

robot/helper_acms_budget_enforcement.py

@@ -224,9 +224,7 @@ def _test_assembled_context() -> None:
     enforcer.add_file("b.txt", "world")
 
     context = enforcer.get_assembled_context()
-    assert context == "hello\nworld", (
-        f"Expected 'hello\\nworld', got {context!r}"
-    )
+    assert context == "hello\nworld", f"Expected 'hello\\nworld', got {context!r}"
 
     # Empty enforcer returns empty string
     enforcer2 = BudgetEnforcer(max_file_size=1000, max_total_size=5000)