fix: Use X | Y syntax in isinstance calls (UP038)

Update isinstance calls to use modern Python 3.10+ union syntax
instead of tuple syntax for better readability.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 2 people

src/empathy_os/memory/short_term.py

@@ -1624,7 +1624,7 @@ def stream_append(
             "agent_id": credentials.agent_id,
             "timestamp": datetime.now().isoformat(),
             **{
-                str(k): json.dumps(v) if isinstance(v, (dict, list)) else str(v)
+                str(k): json.dumps(v) if isinstance(v, dict | list) else str(v)
                 for k, v in data.items()
             },
         }

src/empathy_os/project_index/scanner.py

@@ -361,12 +361,12 @@ def _analyze_python_ast(self, tree: ast.AST) -> dict[str, Any]:
 
         for node in ast.walk(tree):
             # Check for docstrings
-            if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef, ast.ClassDef, ast.Module)):
+            if isinstance(node, ast.FunctionDef | ast.AsyncFunctionDef | ast.ClassDef | ast.Module):
                 if ast.get_docstring(node):
                     result["has_docstrings"] = True
 
             # Check for type hints
-            if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef)):
+            if isinstance(node, ast.FunctionDef | ast.AsyncFunctionDef):
                 if node.returns or any(arg.annotation for arg in node.args.args):
                     result["has_type_hints"] = True
 
@@ -376,7 +376,9 @@ def _analyze_python_ast(self, tree: ast.AST) -> dict[str, Any]:
 
                 # Simple complexity: count branches
                 for child in ast.walk(node):
-                    if isinstance(child, (ast.If, ast.For, ast.While, ast.Try, ast.ExceptHandler)):
+                    if isinstance(
+                        child, ast.If | ast.For | ast.While | ast.Try | ast.ExceptHandler
+                    ):
                         result["complexity"] += 1.0
 
             # Track imports