test(runner): teach the web fakes to take the step's logs

Claude-Session: https://claude.ai/code/session_01ShuAy8q8ZfPi8KHxwc8JpQ

internal/runner/web_extractor_trace_test.go

@@ -47,6 +47,8 @@ func (d *webMockDriver) NextActionFromV8(context.Context) (json.RawMessage, erro
 
 func (d *webMockDriver) SetLastAction(context.Context, json.RawMessage) error { return nil }
 
+func (d *webMockDriver) SetLogs(context.Context, json.RawMessage) error { return nil }
+
 // TestRunner_TraceRecordsTheValueTheVerdictUsed fails if the trace and the
 // verdict disagree about an extractor. A witness is only an explanation of a
 // violation if it holds the state the violated property was evaluated against.