SACRAMENTO (AP) - Even as lawmakers on both sides of the aisle prepared for a deepening of California's 20-day budget deadlock, party leaders emerged from a meeting Tuesday with Gov. Arnold Schwarzenegger with a tentative agreement on a key issue that has been holding up resolution of the state spending plan. Despite the harsh partisan rancor that has enveloped the Capitol during the last several days, officials say the handshake over how public schools can contract services with private companies could pave the way for a broader agreement on the last remaining hurdles facing budget negotiators. "I think we are...