fix: ruff PTH123 violations by reviewer-B

Author: Dev Engineer

.secrets.baseline.new

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+from pathlib import Path
 from typing import Any
 
 from .models import ChangeAction, ChangeSource, DeployPlan, ResourceChange
@@ -41,7 +42,7 @@ def parse_cloudformation_changeset(changeset_json: str | dict[str, Any]) -> Depl
         try:
             data = json.loads(changeset_json)
         except json.JSONDecodeError:
-            with open(changeset_json) as f:
+            with Path(changeset_json).open() as f:
                 data = json.load(f)
     else:
         data = changeset_json

src/deploydiff/cloudformation_parser.py

@@ -233,7 +233,7 @@ def _load_pricing(pricing_file: str | Path | None = None) -> dict[str, dict[str,
     if not path.exists():
         return DEFAULT_PRICING.copy()
 
-    with open(path) as f:
+    with path.open() as f:
         custom = json.load(f)
 
     # Merge with defaults (custom overrides)

src/deploydiff/cost_estimator.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+from pathlib import Path
 from typing import Any
 
 from .models import ChangeAction, ChangeSource, DeployPlan, ResourceChange
@@ -39,7 +40,7 @@ def parse_pulumi_preview(preview_json: str | dict[str, Any]) -> DeployPlan:
         try:
             data = json.loads(preview_json)
         except json.JSONDecodeError:
-            with open(preview_json) as f:
+            with Path(preview_json).open() as f:
                 data = json.load(f)
     else:
         data = preview_json

src/deploydiff/pulumi_parser.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+from pathlib import Path
 from typing import Any
 
 from .models import ChangeAction, ChangeSource, DeployPlan, ResourceChange
@@ -33,7 +34,7 @@ def parse_terraform_plan(plan_json: str | dict[str, Any]) -> DeployPlan:
             data = json.loads(plan_json)
         except json.JSONDecodeError:
             # Try as file path
-            with open(plan_json) as f:
+            with Path(plan_json).open() as f:
                 data = json.load(f)
     else:
         data = plan_json