fix: prevent test pollution by ensuring inputs are cloned (anthropics#499)

Always create a new object copy of defaultInputs to prevent mutations from affecting other tests.

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

Co-authored-by: Claude <noreply@anthropic.com>

Author: ashwin-ant

test/mockContext.ts

@@ -72,7 +72,7 @@ export const createMockAutomationContext = (
 
   const mergedInputs = overrides.inputs
     ? { ...defaultInputs, ...overrides.inputs }
-    : defaultInputs;
+    : { ...defaultInputs };
 
   return { ...baseContext, ...overrides, inputs: mergedInputs };
 };