fix(test): also clear spy history in afterEach teardown

Add mockClear() calls in teardownStdioTest before mockRestore() to
ensure spy call history is cleaned up both before and after each test.
This provides more robust test isolation for Node.js 24 where spy
state may persist across test boundaries.

Author: jdalton

test/utils/stdio-test-helper.ts

@@ -66,6 +66,12 @@ export function teardownStdioTest(
   stream: NodeJS.WriteStream & Writable,
   context: StdioTestContext,
 ): void {
+  // Clear call history before restoring
+  context.writeSpy?.mockClear()
+  context.cursorToSpy?.mockClear()
+  context.clearLineSpy?.mockClear()
+  context.clearScreenDownSpy?.mockClear()
+
   // Restore spies
   context.writeSpy?.mockRestore()
   context.cursorToSpy?.mockRestore()